How can I vibrate the u.a. activate at Mupen64plus-next?

I using retroach nigthlybuild from 2019-08-19 on my Switch with 8.1.0 My question is, how do I activate the vibrating of the Joycons’ rumble motors? In this special case in the Mupen64plus-next core.

Once I did it, this config is unfortunately lost and I do not know how it was done. >.<