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Add the story points to the "Two Dimensional Filter Statistics" dashboard gadget. You can not add custom external gadgets to Jira cloud. This works around the issue. See also
Add Story Points to Jira Dashboard
Add the story points to the "Two Dimensional Filter Statistics" dashboard gadget. You can not add custom external gadgets to Jira cloud. This works around the issue.
https://answers.atlassian.com/questions/85876/two-dimensional-filter-statistics-summing-story-points
https://jira.atlassian.com/browse/JRA-23864
version 0.2 adds sorting to columns headers.
version 0.4 adds Estimated and Actual Story points