I explain myself better, I have already created a code that gives me a multi-selection button and also filters results in a checkbox, now I want to insert it in the "create issue" tab and I do not see how, can you help me?
But do note that using java script in field descriptions will trigger the code anywhere that field is present, so if you only want the behavior to occur on the create issue transition, make sure you are only using the field on that one screen, and have different screens in use for the rest of your transitions.
Alternatively there are paid add-on apps like "JsIncluder" that allow for additional control over custom java injection, or you could also look into free alternative solutions such as the "JIRA Toolkit Plugin" that can be used pre-populate some fields with data on create as covered in "How To Add a Message or Field on JIRA Create Issue Screen"
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