I tried this but not working
Okay so I still encountered some problem yesterday but I finally managed to get it 100% working
First thing, I found out that the PS4 Remote Play App in 3.0.0 was working nicely, you can use an apk of that one instead of the playstore current's last version
then I've used Magisk to hide PS4 Remote Play and Remote Play Assistant
Magisk is hidden as well within the settings.
My activated modules are PS4 Remote Play Enabler and Xposed Framework
on the Xposed installer app make sure that Xposed Framework version 90-beta3 (currently) is active (if not you can install it within that app)
then inside the modules of that app make sure that the Remote Play Assistant is checked.
Reboot and try it out, hopefully it should work in your side as well.
It's worth noting that remote play has to be linked to the PS4 with the same PSN account than the ones you're using to play if you want to get the joycons working