Yes, JIRA can hold links out to OCS items.
In the other directtion, as long as OCS can be made to issue REST calls to JIRA, then you should get links that way too.
I'd be thinking of writing a Connect add-on to link the two, I can't find such an add-on in the marketplace. But you need to define what you want from the connection before you do much more.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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