None of the consumer Navi 2x cards are 'officially' supported. Nevertheless, you can use the ROCm libraries anyway by setting:

    export HSA_OVERRIDE_GFX_VERSION=10.3.0

That will make your gfx1031 card pretend to be gfx1030, which is a supported architecture. Those processors were given different numbers in case an incompatibility was found, but I haven't heard of any thus far.

Obviously, that's not as good as official support, but I hope it helps.