Hi Florence - Welcome to the Atlassian Community!
Sounds like you want to add that to the list of options for the Resolution field.
Got to Settings > Issues > Issue Attributes > Resolutions
Then add that as a new Resolution.
Then you will need to update your workflow for the transition that moves to the done status category to add that to your post function. (If you are using a transition screen to select the OBE option when you mark an issue as done then should be already ready to go)
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