If you don’t want to wait for the integration you could move from Franz to one of the other aggregators that allow you to use any tool you like rather than having to wait for the devs to integrate/support.
Wavebox is the tool I use but Rambox, and Station also work. Stack is another new take on the idea that also allows for use with any URL.
Franz is good but a little outdated IMO.
If you decide on Wavebox, you can use Discount Code: INVITE_iltrnqlacn to get 20% off.