I’m not saying I don’t believe you, but this would be the first time I’m hearing of a device which is supported in ZHA but not in Z2M.
Post the model number & manufacturer ID. You’re probably 1 line away from getting support for them in Z2M.
EDIT:
Your only other post regarding zigbee mentioned that you have 2 SLZB-06. The smart people were smart enough to not suggest using it via its usb port, since you’d need separate hardware to run it on. Connecting it via network is the most straightforward step & does not require separate hardware, especially since your other post only mentioned Z2M & had no mention of multiple ZHA installs.