Creating a Virtual Singer VSTi

Hello,

I am one of the developers of Cantamus (https://cantamus.app/).
We have a quite nice sounding synthesis technology for the singing voice and we are exploring the idea of integrating it into Musescore.
After reading the Musescore handbook I came to the conclusion the only way to do that would be a VSTi. But there I haven't found much documentation about it beyond this: https://musescore.org/en/handbook/4/working-vst-and-vsti

We need to know how Musescore is sending the lyrics to the VSTi. In particular, it would be ideal for us if we could access the whole score in MusicXML format (or any other format we can transform). I know this can be done in plugins but there is no information about VSTis.

We believe this integration would be a dream come true for many vocal score composers.

Any help would be highly appreciated!