diff --git a/Packages/DXE2/X2LogJsonDXE2.dpk b/Packages/DXE2/X2LogJsonDXE2.dpk
index 231d32c..aa92f19 100644
--- a/Packages/DXE2/X2LogJsonDXE2.dpk
+++ b/Packages/DXE2/X2LogJsonDXE2.dpk
@@ -30,7 +30,8 @@ package X2LogJsonDXE2;
 
 requires
   rtl,
-  X2LogDXE2;
+  X2LogDXE2,
+  soaprtl;
 
 contains
   X2Log.TextFormatter.Json in '..\..\X2Log.TextFormatter.Json.pas',
diff --git a/Packages/DXE2/X2LogJsonDXE2.dproj b/Packages/DXE2/X2LogJsonDXE2.dproj
index 63fae2e..837cd8d 100644
--- a/Packages/DXE2/X2LogJsonDXE2.dproj
+++ b/Packages/DXE2/X2LogJsonDXE2.dproj
@@ -125,6 +125,7 @@
 			</DelphiCompile>
 			<DCCReference Include="rtl.dcp"/>
 			<DCCReference Include="X2LogDXE2.dcp"/>
+			<DCCReference Include="soaprtl.dcp"/>
 			<DCCReference Include="..\..\X2Log.TextFormatter.Json.pas"/>
 			<DCCReference Include="..\..\X2Log.JsonDataObjects.pas"/>
 			<BuildConfiguration Include="Release">
diff --git a/X2Log.Observer.LogFile.pas b/X2Log.Observer.LogFile.pas
index ff9faeb..4187c32 100644
--- a/X2Log.Observer.LogFile.pas
+++ b/X2Log.Observer.LogFile.pas
@@ -69,6 +69,7 @@ type
   protected
     { IX2LogTextFormatterHelper }
     function GetDetailsFilename: string;
+    function SaveDetailsToStream(AStream: TStream): Boolean;
 
     property Entry: TX2LogQueueEntry read FEntry;
     property LogFileName: string read FLogFileName;
@@ -246,4 +247,15 @@ begin
   end;
 end;
 
+
+function TX2LogFileTextFormatterHelper.SaveDetailsToStream(AStream: TStream): Boolean;
+var
+  logDetailsStreamable: IX2LogDetailsStreamable;
+
+begin
+  Result := Supports(Entry.Details, IX2LogDetailsStreamable, logDetailsStreamable);
+  if Result then
+    logDetailsStreamable.SaveToStream(AStream);
+end;
+
 end.
diff --git a/X2Log.TextFormatter.Intf.pas b/X2Log.TextFormatter.Intf.pas
index 020c275..5c1db64 100644
--- a/X2Log.TextFormatter.Intf.pas
+++ b/X2Log.TextFormatter.Intf.pas
@@ -2,12 +2,15 @@ unit X2Log.TextFormatter.Intf;
 
 interface
 uses
+  System.Classes,
+
   X2Log.Intf;
 
 type
   IX2LogTextFormatterHelper = interface
     ['{D1A1DAD5-0F96-491F-8BD5-0B9D0BE87C32}']
     function GetDetailsFilename: string;
+    function SaveDetailsToStream(AStream: TStream): Boolean;
   end;
 
   IX2LogTextFormatter = interface
diff --git a/X2Log.TextFormatter.Json.pas b/X2Log.TextFormatter.Json.pas
index df71314..61f192a 100644
--- a/X2Log.TextFormatter.Json.pas
+++ b/X2Log.TextFormatter.Json.pas
@@ -22,29 +22,45 @@ type
   TX2LogJsonTextFormatter = class(TInterfacedObject, IX2LogTextFormatter)
   private
     FSingleLine: Boolean;
+    FInlineFields: Boolean;
+    FInlineDetails: Boolean;
     FStyle: TX2LogJsonStyle;
   protected
     function GetText(AHelper: IX2LogTextFormatterHelper; ALevel: TX2LogLevel; ADateTime: TDateTime; const AMessage: string; const ACategory: string; ADetails: IX2LogDetails): string;
     procedure AddDictionaryDetails(AObject: TJsonObject; ADetails: IX2LogDetailsDictionary);
 
     property SingleLine: Boolean read FSingleLine;
+    property InlineFields: Boolean read FInlineFields;
+    property InlineDetails: Boolean read FInlineDetails;
     property Style: TX2LogJsonStyle read FStyle;
   public
-    constructor Create(ASingleLine: Boolean = True; AStyle: TX2LogJsonStyle = TX2LogJsonStyle.Default);
+    {
+      If AInlineFields is False, dictionary keys/values will be added to a
+      "fields" object instead of directly in the message, similar to Serilog's
+      Elasticsearch sink option with the same name.
+
+      If AInlineDetails is False, the details will be written to a separate file and
+      the detailsFile value will contain the file name.
+    }
+    constructor Create(ASingleLine: Boolean = True; AStyle: TX2LogJsonStyle = TX2LogJsonStyle.Default; AInlineFields: Boolean = True; AInlineDetails: Boolean = True);
   end;
 
 
 implementation
 uses
+  Soap.EncdDecd,
+  System.Classes,
   System.SysUtils;
 
 
 { TX2LogJsonTextFormatter }
-constructor TX2LogJsonTextFormatter.Create(ASingleLine: Boolean; AStyle: TX2LogJsonStyle);
+constructor TX2LogJsonTextFormatter.Create(ASingleLine: Boolean; AStyle: TX2LogJsonStyle; AInlineFields, AInlineDetails: Boolean);
 begin
   inherited Create;
 
   FSingleLine := ASingleLine;
+  FInlineFields := AInlineFields;
+  FInlineDetails := AInlineDetails;
   FStyle := AStyle;
 end;
 
@@ -58,6 +74,8 @@ var
   line: TJsonObject;
   dictionaryDetails: IX2LogDetailsDictionary;
   detailsFileName: string;
+  detailsStream: TMemoryStream;
+  encodedStream: TStringStream;
 
 begin
   line := TJsonObject.Create;
@@ -82,12 +100,36 @@ begin
 
     if Supports(ADetails, IX2LogDetailsDictionary, dictionaryDetails) then
     begin
-      AddDictionaryDetails(line, dictionaryDetails);
+      if InlineFields then
+        AddDictionaryDetails(line, dictionaryDetails)
+      else
+        AddDictionaryDetails(line.O['fields'], dictionaryDetails);
     end else
     begin
-      detailsFileName := AHelper.GetDetailsFilename;
-      if Length(detailsFileName) > 0 then
-        line.S['details'] := ExtractFileName(detailsFileName);
+      if InlineDetails then
+      begin
+        detailsStream := TMemoryStream.Create;
+        try
+          if AHelper.SaveDetailsToStream(detailsStream) then
+          begin
+            detailsStream.Position := 0;
+            encodedStream := TStringStream.Create;
+            try
+              EncodeStream(detailsStream, encodedStream);
+              line.S['details'] := encodedStream.DataString;
+            finally
+              FreeAndNil(encodedStream);
+            end;
+          end;
+        finally
+          FreeAndNil(detailsStream);
+        end;
+      end else
+      begin
+        detailsFileName := AHelper.GetDetailsFilename;
+        if Length(detailsFileName) > 0 then
+          line.S['detailsFile'] := ExtractFileName(detailsFileName);
+      end;
     end;
 
     Result := line.ToJSON(SingleLine);