It's actually very easy to paint that with just about any sort of spray paint. Prep of course is the key to it sticking and lasting a long time.
Personally though I would put the Mopar headliner over it, as it will help keep the noise out, as well as the outside air.
https://www.amazon.com/dp/B01LRJ7UDW/?tag=jkforum-20
That does fit your 2018, contrary to what it says.