something to keep in mind...
I am not sure where everyone else lives or if this is a concern but adult dragonflies feed on mosquitoes and female mosquitoes take blood meals from birds and mammals, which are both carriers of diseases such as West Nile Virus and Eastern Equine Encephalitis. I know that the latter can sometimes kill birds but don't know if this would be concern in reptiles - maybe a vet can step in here? yes, I realize that chameleons might eat these in the wild and it might also cause its death in the wild? Or maybe it would not be a problem. My other thought is, why bother. Dragonflies have next to no "meat", they are mostly head and wing and have slender abdomens. An egg carrying female would lend the most, but there is surely more chitin to digest then anything else. just some thoughts.
JustinIgor - have you tried just holding your cham and gently pressing with thumb and forefinger on either side of his mouth (come from behind while holding) - toward the back so he doesn't get your finger - so he will open his mouth and place a meaty roach or superworm in? I know you said in another post that you shoved some food in (not quite sure how you did that). I find when Cy gets too picky about eating this is a very easy way to get him to open and he then readily eats what's in his mouth, but he is a pretty mellow guy.
Anyway, best of luck with your vet visit!
lele