Modify Animation Software for use with Unity Assets

Seeking a programmer who can modify an existing 3D animation program (freeware) so as to allow a character model to be loaded from a unity file (provided), and also allow animations created with the software to likewise be saved as unity animation files.

Detailed instructions are available in the file package here:
https://drive.google.com/file/d/1rCKomMEVxR21ymbkBterFSrtuSkQTvIn/view?usp=sharing

And you will need this animation software:
https://learnmmd.com/downloads/