Can I set custom fields about a board through a mutation?

Hello! I’m trying to figure out if it’s possible to create custom fields about a board which I can add information to with a mutation. I’m not talking items on a board, I’m thinking more of fields ABOUT the board, like this one:

For exampel, If i wanted to have two or three more fields, for example a status on the whole board instead of each activity, could I do that and then populate the field with a mutation?