I need to apply styling for some custom fields that are read only to change the background and other stuffs. Is there any other way to apply the styling for the fields apart from placing the code in announcement banner?
You can actually do it but you have to make sure you are selecting the exact and unique html attributes that Jira is providing in the custom field.
The alternative is to use Scripted Fields from ScriptRunner.
To make sure the JS is scoped within the project or even issuetype you can use JSIncluder.
Keep in mind these are not fully supported by Atlassian, but you can always revert back to the community if there are issues.
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