Hi Sathish,
As VIM is a not a SAP Standard, no readymade Fiori app is currently availble in Fiori apps catalog. As it is owned by Opentext people you may get in touch with them to get further information. Recently I heard that SAP held an workshop with OpenText people to work on the same as your requirement i.e custom Fiori app for VIM workflows. As per my knowledge Open text has some plans to release their own Fiori app for VIM Blocked and Unblocked Invoice approvals. But may be as part of their initials release they may not support blocked invoices. Please refer below link, it might be helpful for you.
Build Your Own Fiori App (BYOFA) workshop with OpenText
But you can create your own custom app to serve this purpose by copying and manipulating with standard VIM functional modules but you might be ended with extended development time and continuous hectic code upgradations whenever VIM patch upgrades happens. I hope this info helpful to you.
Regards,
Arun