I want to create a user in JIRA to just be able to assign issues to a limited list of users and not all of them.
How to do that ?
You can't do that as written.
The assignee field is limited to "people in this project who have the permission 'assignable user'". That list remains the same irrespective of who is doing the assigning.
You can always install free addons e.g.
thanks to this you will be able to set this in the field configuration
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