A horse/ goat
"Support Benefit Your horse adds momentum to your charge. Until the start of your next turn, if you moved at least 10 feet on the action before your attack, add a circumstance bonus to damage to that attack equal to twice the number of damage dice. If your weapon already has the jousting weapon trait, increase the trait’s damage bonus by 2 per die instead."
I would say yes you add +2 damage per dice.
I could see some dms saying it makes no sense with a ranged weapon, melee only. Or even only when you move towards a target.
Even more in depth only when you move towards a target, but if you move away you don't get the bonus.
But as I see it written it's work.