Feature Request : API generalized Tutorial and more variety in voices in Text to Speech

Hi Thunkable Staff :
I wish to request for certain help as in adding some features to Thunkable.
When we use APIs , there are a lot of variety of APIs available , many times its not mentioned there how to use it externally, if Thunkable can provide a tutorial which has generalized instructions to use an API where we just have to add the URL and key and do certain definite steps to make it work, will be great.
2) As an educator, I come across many times my students wishing to use some cartoon characters voices in text to speech component, is it possible for Thunkable to have some sounds available for this?

Please help If I need to request these on some other platform or of these are already answered in previous posts . TIA.