Yes, that is possible but this requires mapping of the ACL with the WLAN, unlike blocking a client from Unleashed dashboard (it blocks the client on all the WLAN on system level).
Regards,
Syamantak Omer
Syamantak Omer | Community moderator | Staff TSE | CWNA | CCNA | RASZA | RICXI | Follow me at https://linkedin.com/in/syamantak-omer-5949b6124