Directing Specific Traffic to Specific WAN

I have a Max BR1 Pro5G with multiple connection to the internet. Cellular, WLAN, WiFi. I’m not sure if I can obtain the functionality to direct specific device traffic to different internet sources simultaneously? As example, I’d like to direct my TV traffic trough the WiFi and all other data traffic through the WLAN.

Can this be done?

Yes this can be done by identifying the source traffic and setting up enforced outbound rules.
Look here in the online manual:
https://manual.peplink.com/documentation/peplink-b-series-user-manual/ch12-outbound-policy/adding-rules-for-outbound-policy/