Jiren (FP) having the slightest superiority to Belmod is completely valid, therefore I have Heles and Liquiir very slightly over Jiren (FP), therefore, individually they could defeat him.
If it's Jiren (Beyond Limits), you could comfortably beat them individually. If they are 1 vs 2 I would say that the team would win.
Also I'm not even taking Hakai into account, as it seems to be an amplifying attack.