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Could you please tell us a bit more about your use case - about what you are trying to achieve? For example, if you want to join two properties in a table, then you solution would be to use a ColumnGenerator.
I was under the impression that i need to store multiple values in the field, which can be avoided as far as I went. I was surprised there's this restriction. One should be carefull to make the component he uses in a fashion that he can manage with a single component field.