We are currently working more with Marketing lists. In there we have a subgrid to display all our contacts (subgrid is created under the contact entity). Moreover, our contacts are connected with accounts through a 1:N relationship. 
However, in the subgrid we are not able to retrieve some column data from the account associated with the contact. 
Example: Contact A is connected with Account AB. Account AB contains a customer type called "High profile". On the marketing list subgrid under members we are showing various columns from the contact entity, but also wish to show the Customer type from Account AB. 

How can this be done as currently the columns are just empty?