@Vincent901 you can try, but be prepared for the guests to decline to pay, saying the fire resulted from the grill being unclean, and for Airbnb to side with them, and for them to leave you a retaliatory review.
I think in your shoes I would probably be more concerned with figuring out whether/how you can make the grill safely available in future. It must be cleaned before every guest, it must not be close to the house, etc..
https://www.airbnb.com/help/article/264/what-do-i-do-if-my-guest-breaks-something-in-my-place