Thanks for reaching out to us, and I apologize for the delayed response. You can find a guide to the Geekbench 4 command-line tool here.
If you are interested in running a particular workload within a benchmark in the Pro version, you can run geekbench4 --workload-list to view available sections and workloads as well as their numerical codes. You can then use, for example geekbench4 --section 1 --workload 101 to run a specific Single-Core CPU workload.
Please let me know if you have any other questions.