Hi @Chr1sG,
Yes, I want to be able to have Single-Select (or Multi-Select, Icon, etc.) as possible formula outcome and with the according value. The reason is that Boards only allow certain field types to be used for the row/column labels. Also, I clearly prefer structured data to free text, so if I can generate controlled dictionaries rather than free text, then that’s a plus. 
Just a thought: Maybe in the formula editor I should be able to select the output type, rather than it be generated.