There is not a framework in JIRA to do this. A workflow transition gives you the transition screen (if you choose to set one) and that's all. Add-ons don't have direct access to that because it's part of the core functionality.
You'd need to hack the core functionality to enable it directly.
Indirectly, you could add a field that triggers your add-on, but I suspect that would be clumsy and not as functional as you would like.
A better option would be to work with the system. Why are you trying to do this? What is the goal of it? Why not do it with transision screens, conditions, validators, post-functions etc?
I am having requirement to upload some fields to other website. i have download plugin for that but i dont want to display that plugin UI to every user. Is this possible to hide Plugin UI from Specific user because i dont want to give access to other users. But that plugin is display on main screen of Jira just like other fields. Please give me solution.
>I am having requirement to upload some fields to other website
The plugin you have downloaded obviously doesn't work as part of a transition for the reasons I've given already.
If you want to send data over to another system during a transition, you will need to find or write a post-function to do the send, or, if the other system supports web-hooks, use them to post the data. That process will need to take data from fields on the issue which you are transitioning.
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