ds34vita has the DualSense support. This is only made for people who don't want all three controller support.

ds5vita

Warning: I have no Idea if this works. Please let me know. And use it at your OWN RISK!

Download: https://github.com/hedhehd/ds5vita/releases

Installation:

1. Add ds5vita.skprx to taiHEN's config (ux0:/tai/config.txt):

   *KERNEL
   ux0:tai/ds5vita.skprx
   

2. You need to refresh the config.txt by rebooting or through VitaShell.

Pairing the controller:

1. Go to Settings -> Devices -> Bluetooth Devices
2. Press SHARE+PS on the DS5 for about 3-4 seconds, until the lightbar blinks very quickly
3. The DS5 will then connect and be paired (don't press over it when it appears)

Using it once paired (see above):

1. Just press the PS button and it will connect to the Vita

Note: If you use Mai, don't put the plugin inside ux0:/plugins because Mai will load all stuff you put in there...