Hi, @Kim_Streich. I spoke to dev and there is no way to just pull a list of all merge fields, but they are going to help us compile a list. I’ll post what they find as they find them. Also, I can (sadly) confirm that the fields you are looking for are not exposed as merge fields.
Until I can get this into a more consumable format (somewhere in the help center), here is a Google sheet
That spreadsheet came directly from a staff engineer who has been here longer that I have And from what I understand, if it isn’t available on the front-end or isn’t listed on that spreadsheet then it isn’t an available merge field. So I don’t think just formatting a field like a merge field will do anything.