I'm a bit confused here. This is a Post view that you want to filter by a user custom field ? Normally you wouldnt be able to filter a post view by a user field
Does the post have a similar custom field or a field that both users and post have in common ?
In parallel with this shortcode, I want to use (conditional view) or (if view) to limit the view to certain users depends on their user custom field value.
I hope that the general idea is clear.
If you have a suggestion to get the same result, it is appreciated to share it with me.