Dropdown power query

[Cuorepazzu]

Dear

Is there a way to add an additional column with a dropdown menu?
I would like for example, next to the column item number, a column where you can select the responsible person for this item from the dropdown menu.

Thanks a lot!

(This table was created with power query)

[#2]

You Can, just type a new header next to the table. But any manually entered data in any new column gets deleted once you refresh that query.