Hi Jan,
Yes, you can preserve header formatting by going to Options > Data Settings, and check "Preserve header formatting" under the Excel headers section. I ran a few tests and it works as expected (I'm using 12.1). Please note this is a global setting so it will apply to all of the scripts/data files for that user.
Another option is to set the log column somewhere to the far right where it won't be seen and then use a different cell with your own formatting. In the example below. I'm referencing the log header in cell AD and applied my own formatting in cell AD.
------------------------------
Maria Simpson | Solutions Engineer
Winshuttle North America | 4255276647
------------------------------