Hide already selected choice in a GF Add-on feed

I am fetching a list of databases list and showing them as choices in a select box dropdown list. I want to hide the option inside the form feed setting once it gets selected.

Can anyone let me know how can I get the saved feed database options? or any way to hide the option(dropdown choice) once it gets selected for the same form.

I want when I save Database 1 as feed for the form then it should be hidden when I try to create a feed with Database 2 from the same form.

Is this along the lines of what you are looking for?

That works in form submission, but I am not sure if it works in feeds, or can be used as inspiration for your own code.

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