Certified GKH Gardening Expert
Peppers will not be picky about the type of fertilizer you use. In fact, I have experimented with individual chemical components of fertilizers in their raw form just to compare to premixed fertilizers. They respond just about the same, as long as there isn't too much nitrogen.
You can feed once at transplant, and once at the start of fruiting, or you can feed as I do- Half strength ever 2 weeks or so with plain waterings in between.
Here is an article that will help: https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-fertilizer.htm