Custom database column value editor

I want to add a custom editor / viewer for column values. We store zipped JSONs in some columns and it's impossible to view the contents in the database view.

Is it possible to add a custom editor or viewer like the ones for dates / timestamps? I added the source and code of database-openapi and a dependency on com.intellij.database but I haven't found anything. The source code is hard to search because obviously I only find the API but none of the implementations.

https://jb.gg/ipe?extensions=com.intellij.database.modelExternalData or any of the other links in https://plugins.jetbrains.com/docs/intellij/data-grip-extension-point-list.html#note-legend don't work at all.