Enable the ability to hide SharePoint form fields based on the value of Lookup columns
Using a JSON snippet, it is possible to show or hide a field in a form for an item in a modern list based on the value of another form field. This capability does not currently work if referencing the value of a Lookup field. Please enable this ability so that the value of a Lookup field can be used to show or hide form fields.
In fact, this capability already exists, but with some quirks. Denis Molodtsov demonstrated a workaround here: https://sharepoint.stackexchange.com/a/292805/74663. I ask that Microsoft consider polishing this capability so that it does not require an additional click outside the control to initiate the show/hide behavior, and that .lookupValue or .lookupId could be used in place of the more-complicated construction in the workaround at the link.