Is it possible to update a Freeform submission via twig?
Update: Solspace informed me this could be accomplished with a custom module and using a Freeform event, specifically this one:
https://docs.solspace.com/craft/freeform/v3/developer/submission-events.html#before-a-submission-is-submitted&quot;.
So, in my example, I will need to move my lat/lng logic into the custom module so it happens before the submission is submitted. Then, on the result page, grab the lat/lng from the submission data.