Depends on the supermajor. I know BP for sure has a retail arm where they own gas stations in addition to franchises. Same for shell.

the franchisee has a profit motive too. If adding a charging station brings in more revenue - I don't see why the franchisee would refuse.

Also, factor in that charging times are longer for EV. This means they'll spend more money at the in-station cafe/convenience store vs the avg IC car driver.

I can see that. Gas at gas stations is more of a loss leader, the real profits are in alcohol and tobacco.

franchising agreements can force people to add new products like the McRib, or charging stations or lose supply.