This app was mentioned in 3 comments, with an average of 1.67 upvotes
Have a look of https://github.com/termux/termux-styling and https://play.google.com/store/apps/details?id=com.termux.styling
Termux:Styling would be the easiest way.
Oh, I see they want a bit o' cash. https://play.google.com/store/apps/details?id=com.termux.styling