Hi!
You should modify or create screen for Bug issue type.
https://confluence.atlassian.com/jira/configuring-fields-and-screens-187859099.html
https://confluence.atlassian.com/jira/defining-a-screen-185729487.html
Create new custom field and add them to this screen and voilla!
If you have any question let me know
Michal
Define different screens and/or field configuration schemes for the different types of issues.
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