I have looked but I can’t find a way to set the background color for text overlay on banners (Lines 1,2,3). For example normally once can specify background color and opacity for most items but not banner text.
Can you please provide a real life example? A screenshot with explanation e.g? Are you looking for a background for each text row? If this is what you want then there is no such option and you will need to use some custom CSS: