Invite guest user to a private channel meeting

Hi,

I have a team with two private channels (set up as a work around for Teams not having the breakout room feature for meetings).

I have guest users who are assigned to one or other private channel.

When I send an invite I can only add the general channel and not one of the private channels. Is it possible to invite to a private channel without opening the meeting in the guest channel first?

Thanks

Phil