OVPN fixed IPs for road warriors without client specific override

[maxbw]

Hi all,
we're running 20.7 as a ovpn server and it works like a charm. Now we want to set up a second ovpn server with many hundreds of ovpn clients. All of them should always get the same IP.
Is there a way to have a table or so to get it done instead of using client specific overrides as that would be quite a bit of work, to write all these overrides?
Thanks, regards, Max