Taskpaper syntax and "sync"

I appreciate very much the possibility to use in Drafts TaskPaper syntax, but…
is there any possibility to sync with a TP file (TP app)? both use iCloud actually

Drafts does not use iCloud Drive for sync it uses an iCloud database. It is storing records, not files.

You could round trip data between a file and a draft, but it isn’t going to be a true sync solution.