Multiple plan owners

In Plan details there is not the option to add multiple owners for same plan.  This option is available in MS Teams.  I have noticed that when you are not the owner of a plan, you cannot copy that plan.  Our group has created a task plan template that we use to make multiple plans for each year and attach the plans to coordinating teams.  For this template, we could really use multiple owners even though it is attached to a team with multiple owners