TYPO3 Core

To be honest, this is really long time ago, and don't recall what my problem was back then.

Currently I wish I had described the problem better, to better understand what the solution should be.

But from reading the documentation again, and my short description.
https://docs.typo3.org/m/typo3/reference-tca/master/en-us/ColumnsConfig/Type/Input.html?highlight=blindlinkoptions#linkpopup

It sounds like i meant a whitelisting :)

Ha, I thought so!

I guess whitelisting is a bit more difficult, as this would be restricting extension authors to extend this area. but let's see