1. I want to create a custom field like 'Text field', which need to be associated to the user.
Note: I know that custom fields can be created for issues, but that is not helping in associating the custom field with user.
Do you mean a field associated with the user profile or a field in an issue associated to a user?
Out of the box you can't do either.
Field associated with the user profile, like a extra field to describe details in user profile page.
There may be a plugin. Look in the marketplace
I have a requirement, like I have a external application, which has an unique identification ID, that I want to store in the user information in Jira, how is it possible to associate that unique identification ID of another system.
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