Microsoft have made a number of changes to assist in the assignment of Power Apps licences to users that need them.
In April 2023 users were able to request a licence when they needed it (https://bit.ly/43cMw87), in May 2023 a maker was able to request a licence for users of their app (https://bit.ly/49dHATh), and in September 2023 an IT admin could set up an auto-claim policy that automatically assigns available licences to users as they need them (https://bit.ly/48UUeqH).
The latest innovation (November 2023) is that auto-claim policies are automatically created for a managed environment.
You can find the announcement article here: https://bit.ly/47UpXHp, and find out more about auto-claim policies here: https://bit.ly/3SjVdK3.