Table column's type set to string is not working


I ran into an issue with my table panel where I want to display category numbers of certain products. The type of the column is set to string, because often these numbers include letters, not just numbers. Below is a screenshot of my settings.

Data Source has Crate type, gets information from specific url. It’s worth noting that it recovers all the other data properly and works when it gives back purely numeric value for that column as well.

Anyone has an idea how to fix that? Thanks in advance

I’ll throw a shy bump, since I messed around my query, but nothing helped so far and I’m kind of stuck.