Not officially supported, but has been done with some degree of success (maybe 30/70 work/not work). The main issue is that the inerant latency and some packet loss on a mesh link can triggersome LACP protection mechanisms that cause hiccups with the datapath.
What is the distance, what is the AP type, and what is the configuration (11n/11ac, HT/VHT20/40/80, etc)? Likely better to look at widening the channel before trying a wireless etherchannel. but should there be issues, TAC will not support it.