There are a lot of character sheet default options that can be set outside the game. Unfortunately, this is not one of them. In fact, I can't think of any options that can be pre-set that are in repeating fields such as attacks, actions, spells, etc. Even an API script like ChatSetAttr might have issues, since it woul have to be issued for each repeating field. I've no doubt it could be done with a specialized API (or perhaps ChatSetAttr does have a function for this sort of case), but other than that, no, I'm afraid it's a manual solution.