No.
Never spray them directly.
Take a potted plant, pothos, scheffelar, etc. and stick it in your shower on the floor.
aim the shower head towards the wall, and turn the water to lukewarm, then let the water bounce off the wall and mist onto the plant.
then place your cham on the plant, and he can sit in the mist from the shower, without being directly hit.
do not leave him, they can fall off, esp if its their first shower, and it can make them freak out, and they could drown.