Is there a way to manually add aperture metadata in LrC?

I've shot a series of photos using a Canon EOS RP with a 7Artisans 10mm f/2.8 fisheye lens.  This lens is completely manual, so while the RP saves ISO rating and shutter speed, it does not save the aperture value (as this is manually set with a control ring), which means that one must write down f-stops for each photo if one wishes to retain this data.

My question is: is it currently possible to manually add this f-stop data to pictures once they're imported into LrC?  It's pretty easy to edit all sorts of other metadata, but I have yet to discover how (or indeed if) one can manually insert aperture values (which, quite honestly, one should be able to do anyway if required).