Pi 4 GPU support for distributed projects

On Ubuntu I would join an online distributed project like Einstein@Home, download the correct driver for my amd-gpu and install opencl. After that Einstein@Home would recognize my GPU and begin downloading GPU work units. Without the opencl part I would only receive CPU work units. The Pi 4 has a GPU so my questions are: where is the driver (it is already packaged on one or all distros, how to compile it with the Pi 4 compiler.