net10.0-windows7.0 
namespace System.Speech.Synthesis
{
    public class PromptBuilder
    {
        public void AppendTextWithHint(string textToSpeak, SayAs sayAs);
    }
}
nuget.org
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Reference this API
.NET
5.06.07.08.09.010.0
.NET Core
2.02.12.23.03.1
.NET Framework
3.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard
2.02.1
Information specific to net10.0
Platforms This API is only available when you target a specific platform:
Windows
7.0
Information specific to net10.0-windows7.0
Assemblies

System.Speech , Version=9.0.0.3, PublicKeyToken=31bf3856ad364e35

System.Speech , Version=10.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to System.Speech.

Package System.Speech (9.0.3) net9.0
Platform Restrictions

This API is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API