Any gem to do field level user help?

I’d like to display a question mark next to each field to display a help popup.

I’m wondering if anybody ever thought of creating a gem to do this, or maybe an enhancement to simple_form? This just feels so generic that there should be a gem for this!

While my project has no intent on being localized, maybe it’s a good idea to put the help strings in a yaml file just for this purpose.