I find silkworms don't wiggle or move as much as other worms and bugs so my boys don't really enjoy catching them either. Maybe try to mix one or two in with other worms/bugs in a cup and see if your chameleon will go at them all
So he did eat one today!! Don't know if it was intentional or not cause it was mixed with some phoenix worms and maybe went for one of those guys instead. Hopefully he enjoyed it and from this point on will devour them