rowGroup - Display multiple column values in Group Header.

Hello,
i got a datatable with rowGroup, using following code:

'rowGroup': {
                        startRender: function (rows,group ) {
                            return group;
                        },
                        dataSrc: [1],
                    },

This produces a Group like:

Name

Street | ID | Order
Street | ID | Order
Street | ID | Order
Street | ID | Order

And i want a group which looks like:

Name - Street - ID

Order
Order
Order
Order

How can i access the Data and how to modify the group header?

Best Regards,
DTDev