I posted this question at the IBM Docs community forum but it seems to be quite inactive so I'll also try it here.
Link to original question: https://www.ibm.com/developerworks/community/forums/html/topic?id=c5cff49e-3e32-4c5d-b5b1-4b7c9dbe9bf5
I configured customs fonts and can select them when I'm editing documents.
How can I set one of them as default font when I create a new document in Docs?
Is there a kind of template file that is used when a new document or spreadsheet is created?