A pre-filled automatically created (dynamic) custom filed as result of a script added to Jira .
How to grey-out this field and prevent users from entering any value into this field
and display the prefilled automatically generated value in this greyed-out field?
If you are on Server, then I'd suggest the use of a "scripted field". If you're on Cloud, you can still script fields, but you'll also need to ensure you remove them from the "edit" screen so that people cannot edit them.
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