Could you check out this community post on how to create Capacity planning merics?
You can use the MDX formula (it might work slowly in larger accounts) or define a custom field with JavaScript code. The community post describes both scenarios.
In those scenarious, we use Original estimate as an example field. You would like to switch to Story Points there instead.
We use the Issue created date as the start date. Please use the issue start date instead of the issue created date for your use case.
You are already using due date as end date. There is no changes needed for this one.
Daina / support@eazybi.com