Is it possible to hook custom fields in widget’s setting

Hi,

This is munir, i have developed an addon plugin for Siteorigin Widget bundle named “Ultimate Addon for SiteOrigin” https://wordpress.org/plugins/addon-so-widgets-bundle/

I have some thoughts on adding some custumization fields for each of my widgets on the right section of widget form screen as shown in this screenshot:
https://docs.google.com/file/d/0B2MZlPVA5cJ7TXlFMXk4ZUhRNDg/edit

I know there is a hook to add fields for the row settings screen there, but is there a hook same way for the widget also?

Please confirm, as i have some good plans for the contribution to siteorigin my way :)

Regards,
M. Munir Kamal