Hi Pernille
Thanks for reaching out.
It’s possible but will require custom development. Before work on the change can begin you’d have to install a child theme https://purothemes.com/documentation/ultra-theme/child-theme-library/ and then migrate your Customizer settings from the parent to the child theme https://purothemes.com/customizer-settings-export-import/. Once that’s done you’ll then need to copy and paste a file from the parent theme folder into the child theme folder and make edits. If you can complete this sort of task then you can begin by migrating to a child theme as outlined above.