Configure custom fields for webitem page Edited

[hongchao song]

We have some requirements as following:

1. Add a button on the view issue page

2. Popup a page when clicking the button

3. The popuped page shows custom fields, in another word, the popuped page could be configured by screen schemes like create/view/edit issue page. #1 and #2 have been implemented, please refer to the attachments, but #3 seems to not be achieved.

So, could somebody please give us some advice about #3, is it possible? If possible, could you please provide further information?