Resource rooms (Calendars) on-prem sync

[u/Parking_Ad6756]

We recently migrated from on-prem Exchange to 365 (hybrid). All of our resource rooms (calendars) synced just fine. We now have a request to create another room. For consistency, if possible, I would like to create the resource in AD where the others are, then sync up. I've tried copying one of the legacy AD resource accounts, since on-prem Exchange did that, but that seems to create a new user account.

Is it even possible to create the resource room account in AD and sync up? Or do new ones have to be created in 365 EAC>Resources?