I need to allow a specific "group of users" to create issues and I also need to allow to a "specific user" assign an issue previously assigned to him, to other group of users.
On the first one, use the permission scheme as standard. I'd recommend saying "create issue = role of X in the permissions" and then putting your group into the role in the project.
The second one needs code, because there's no way to tie a permission (like "assign issue") to a user based on the fact that they were once an assignee. I'd code a scripted field that listed all previous assignees, that would fix it.
The third thing is "you cannot assign an issue to a group", so I assume you mean "the person to assign it to must be part of another group"
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