RockPI 4C - Connecting an external wireless antenna

I bougth a rockpi 4c board and I’m using it into a metal case, so the internal wifi antenna is useless.
Is it possible to connect an external antenna?
Unfortunately at a quick visual inspection I didn’t find any suitable connector (SMA, UFL).
Any hint is appreciated.

You should buy the T variant for external antenna. If you want to do some soldering work, here is the link: