Option A: Set the datasource to:
Arbitrary Text(‘1234567’:extract with regex (regex pattern = ‘.’ (a single dot))
This looks hacky, but it’s my go to method to create an RG of any arbitrary static lenght without relying on data. Once you have an RG with 7 cells, use the above method outlined by @darren.james7518

Anyone care to explain me, how to acheive this function using Option A. I would like to not rely on plugins. I keep getting errors, see me previous messages above.