RX 550 - GPU not supported

I recently bought a new GPU (the old one broken) Radeon RX550.
I get error message at LibreELEC start:
"failed to start xorg.
is your GPU supported?"
Are there any chance to support RX 550 in the near future?

Thanks for the idea!
A little better with LE9. Kodi starts, video is ok.
But:
1. No hdmi audio (analog is ok)
2. No HW video decoder, just SW