Bell pepper should be added to the tree/ spice selections.
To obtain it you should either pick out birds nests ((as bird feces), and by planting it creating some kind of plant seedling randomly) or extremely rarely in random world generation
As of it was possible to even find bell pepper trees growing in the Nordic regions of Europe.
The bell pepper seed should be planted in the beginning of summer and harvested near the end of summer, so forth making it tedious to get.
As it should be tedious to get, it should definitely offer some kind of good late game food for some hard to get late game attribute.
How i think it should be implemented in the game
As of bell pepper comes, imo. it should be possible to add it in the game as a fruit which gives some kind of feps.
And there should be a possibility to first dry it and then grind it to paprika as a spice.