code: def font(self):
          
          defRPr = (
              self._chartSpace
                  .get_or_add_txPr()
                  .p_lst[0]
                  .get_or_add_pPr()
                  .get_or_add_defRPr()
          )
          return Font(defRPr)
docs: Font object controlling text format defaults for this chart.