Tasleema Yasin says she wrote and performed a vocal phrase used throughout the track ... according to the docs filed Thursday in L.A. Superior Court. Tasleema also says her voice is prominently featured in a countermelody, which she sang in her higher register ... and she says can be heard throughout the song's chorus.

She claims she's a coauthor of "Hussle & Motivate" ... which means she's entitled to a big cut of any dough the song earns.

Tasleema doesn't list a specific amount she's due, and wants the estate to provide a proper accounting ... so she can figure out how much.