pub fn build_google_request(
text: &str,
voice: &str,
add_marks: bool,
input_ssml: Option<&str>,
) -> (Value, Vec<String>)Expand description
Build JSON body for Google TTS REST API.
When input_ssml is Some, it is sent directly as Google’s "ssml" input
(used when tts_speak_ssml passes W3C SSML with the <voice> wrapper
already stripped). Otherwise the text/marks path builds Google SSML or plain
text from text.