How to compile gromacs to use AMD Radeon GPU in new MacPro when OpenCL is not supported anymore?

GROMACS version: 2020.3
GROMACS modification: No
I got a new MacPro running Catalina. These new OSX systems don’t support OpenCL anymore so I am not sure how to do a successful compilation of gromacs to use its AMD Radeon GPU. Is that still possible?