Help with webhooks on custom forms or similar dynamic data

I am struggling with saving the data on a custom form when I use an external lookup field with a webhook.

I have successfully connected a webhook to a lookup field that returns results that match the user’s input. However, it sometimes saves the option the user clicks on and sometimes wipes the field back out when the user clicks away.

From my searching, it may be that the form has nothing to “grab onto”, as in an id.  I don’t know if that’s the cause of my issue or not, but I haven’t been successful creating a json path to return linked label/value pairs, only a single label or ‘all fields’.

I also haven’t been able to pass the data somewhere else without it still being linked to the original field, so as soon as the original field goes blank, everything else does as well. 

I was toying with having a WF webhook listen for when the fields populate, but in my initial test, it doesn’t seem to see a change while the form is still being edited.

Can anyone offer me some insight into how I can hang onto my results?