Describes how the TTS text was generated from a ContentBlock.
The id of the content block referenced by this instance.
The end offset into the source contentBlock referenced.
Describes how the ContentBlock string was modified into the text.value string intended for the SpeechSynthesis engine. An example srcMap value is: "A0:7,D0:3,D9:2"
text.value
The start offset into the source contentBlock text referenced.
The start offset into the mutated ttsRef.text.value where its content corresponds to this instance.