Welcome to the community, @Giner_Ordonez! :grinning_face_with_big_eyes: Your link didn’t work. Part of that was because it’s malformatted (missing a
? between the share ID and the prefill), but fixing that just told me that the item was private.
To share a formula for feedback/input, double-click the field header of your formula field to open the field settings. Copy the full text of the formula, then paste it into a comment. Before submitting the comment, select the formula text and click the preformatted text icon in the editor toolbar (it looks like this: