UI assign item to multiple targets

I need something really simple to be able to assign plan to multiple employees.

First I was thinking about a list and u could just select the employees you want, but this would get really clunky with lets say 10+ employees.

So this got me thinking I would introduce some kind of quick search in the top for employee filtering, but I still dont like this solution at all

The formating and functionality is not completed but you get the idea.. I feel like this takes so much space... I need some kind of solution that is scalable 1-30 employees lets say. I could add also pagination for the list of the employees but that doesnt solve the root of the problem and I dont think that this is readable for the user at all anyway.