It is possible to make all of your licenses floating, and then make one shared token for all of your floating licenses. Team members can then use this token to use the next unused floating license on the account.
https://dev.epicgames.com/community/learning/knowledge-base/9e0b/capturing-reality-how-can-i-give-my-team-access-to-my-floating-licenses-without-giving-out-login-details