Add the possibility to prefill a hidden field in forms

We would like to use Monday forms to collect user feedback from different locations. It would be great to have the possibility to prefill a field corresponding to a column “location”. And it would be even better to have the possibility to hide this field at rendering.
I think there are a lot of use cases that could benefit from this feature.
Today, as far as I know, the Monday.com fields of the form are not named, making prefill impossible, even with visible fields.