Yes, this should work. You obviously wouldn't want to extend that too far, but I don't foresee any problems with two hops. The middle and right-hand AP330 in your scenario should use backhaul&access (assuming you want clients to connect to the middle AP330).
Carsten, we use meshing extensively across our three campuses, and often have several mesh hops between portal and client. While fewer is preferable, multiple is sometimes required, especially if the shortest/primary path is temporarily down due to maintenance / update / reboot etc.