How do I save column filter values for association attributes in Data Grid 2?

Hey everyone,   so I implemented a Data Grid 2 widget and the possibility to save the filtered values. I use the filter widgets in the columns and it’s working, at least for Enmus, Strings and Dates. Unfortunately it doesn’t work with attributes from associated objects.  If I reload the page, the filter widget for the assocaited attributes is empty again. Do you know why and how I can make it working? Because for the user it’s just another column where he wants his filter values to be saved, he/she doesn’t know if it’s an associated attribute or not.   Thanks in advance! :)
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