[AllanJ]

Commandeer another pair of slots, and put in there a breaker set for a subpanel. Put the branch circuit(s) that lost their place(s) together with the new branch circuit for your EV down in the subpanel.

Given the amperes draw of the EV charger (if dialed up to more than 16 amps continuous for a 20 amp circuit), you will need to do a home load analysis whether or not you needed a subpanel for the added breakers. Sample rules at the back of the NEC code book.