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.
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A picture tells a thousand words. And agility boards have just released their latest feature: cover images on issues – so now your board can tell a story at first glance. Upload attachmen...
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