You likely won’t be able to do that yourself.. but the idea here is that rather than making a marketplace request as:
We need a custom plugin that alters trust level behavior
you could just state a request like:
We need a SQL query that gives a list of users having met conditions xyz. We want to use that query for a badge or just run with the Data Explorer.
and that will cost considerably less and practically come without future maintenance costs or complications to your setup.