Enable AI for only certain users?

In order to be able to use AI within my organisation, I’ll need to write a business case, however I’ll need to do a test with a smaller amount of users. I’ve been pouring over the settings and help docs and I can’t seem to find an option for maybe enabling AI for just a subset of users.

Is that possible? I’m not seeing anything in the Workspace settings, but maybe that’s because I don’t have AI enabled (which I can’t enable yet due to security restrictions)?

Thanks in advance!