How to apply css to Jira fields using a connect addon app

[mudita dixit]

I have built a jira add on, using atlassian connect express framework. I am able to get the values of all the fields using rest apis within my app and I am trying to apply css to the fields that do not match a certain criteria, as specified in my app code logic.

Is there a way to access the field css attributes from within the addon and manipulate it, for eg if I want to highlight a field say 'priority' with red border around it ? 

[Petter Gonçalves]

Hello @mudita dixit

Welcome to Atlassian Community!

As you can see in the documentation below, the ability to add/edit javascript, HTML and CSS of Issue fields is a restricted function in JIRA Cloud application:

Restricted functions in JIRA Cloud applications 

The reason this feature is not configurable in Jira Cloud is that it would create an XSS vulnerability that could allow malicious users to gain system administrator permissions and use the Cloud infrastructure for nefarious purposes.

That being said, we have some feature requests to allow the ability to format specific fields descriptions in Jira Cloud, like the one below:

Priorities Description Field to Use Wiki Style Renderer 

Feel free to check on those feature requests and vote/watch to increase its priority and also receive notifications about any updates.

Let us know if you have any questions.