For sure it can be done, but I cannot see the benefit of it. A story point has only meaning in a project (and they are dependent on a number of subjective factors of that project, such as project complexity, etc).
As for how, I will give you only my solution to your problem: JJUPIN + JJUPIN Agile + a simple script, but I'm pretty sure you can find other plugins to solve that, too. Edit: However, this is on standalone, not on cloud.
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