Angelscript UE4 Editor Utility Tool Menu Entry - based on https://kinnaji.com/2020/04/08/toolmenus/

DefaultEditorPerProjectUserSettings.ini

[/Script/UnrealEd.EditorExperimentalSettings]
bEnableEditToolMenusUI=True

[/Script/Blutility.EditorUtilitySubsystem]
+StartupObjects=/Script/Angelscript.TestMenuEntry

TestMenuEntry.as

class UTestMenuEntry : UEditorUtilityToolMenuEntry
{
	default Data.Advanced.EntryType = EMultiBlockType::MenuEntry;
	default Data.Name = n"MakeGame";
	default Data.Label = FText::FromString("Make Game");
	default Data.ToolTip = FText::FromString("Make the game!");
	default Data.Menu = n"MainFrame.MainMenu.Tools";
	default Data.Section = n"Programming";
	default Data.Icon.StyleSetName = n"EditorStyle";
	default Data.Icon.StyleName = n"Persona.ExportToFBX";
	default Data.Icon.SmallStyleName = n"Persona.ExportToFBX.Small";


	UFUNCTION()
	void Run()
	{
		UToolMenus::AddMenuEntryObject(this);
	}

	UFUNCTION(BlueprintOverride)
	bool CanExecute(FToolMenuContext Context) const
	{
		return true;
	}

	UFUNCTION(BlueprintOverride)
	void Execute(FToolMenuContext Context)
	{
		Log("This is working!");
	}
};