In case you did not get it from the illustration, I have compared a bell pepper to the Carolina Reaper and the Dragon’s Breath, two very, very, you-do-not-want-it-in-your-taco-hot peppers.

Here is an easy read on bell peppers and their pungency:

https://www.pepperscale.com/are-bell-peppers-spicy/

You can also find a more complex text about the responsible gene (pun1) here !

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Stewart et al. (2005) “The Pun1 gene for pungency in pepper encodes a putative acyltransferase” https://doi.org/10.1111/j.1365-313X.2005.02410.x