Dear Prashanto,
Believe there is no IBM Cloud storage integration(at least in open source part of OAK),
It would be possible to add one for IBM,
We do have implementation for s3 storage:
jackrabbit-oak\oak-blob-cloud\src\main\java\org\apache\jackrabbit\oak\blob\cloud\s3 have a look it's source code, to have an understanding of what approximately needs to be done for IBM.
Believe it's not a simple task through, probably best performed by Adobe themselves via feature request.
Regards,
Peter