No it's not possible.. Custom fields can only be applied to issues, not even projects.
If you want to add extra information to a version you'll have to build a plugin to do so. It might be that the JIRA metadata plugin has done this already for you. It depends a bit on your use-case I guess.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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