I think it has to be enabled as a module, and the android kernel has it disabled.

Apparently the module is there: https://www.xda-developers.com/google-adds-wireguard-vpn-and...

But you need to be rooted to use it: https://lists.zx2c4.com/pipermail/wireguard/2022-September/0...

As far as I know, you need root permissions to add an interface. Even though the module is enabled, it's not used.

The official wireguard app also mentions wireguard-go