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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
< Părere la script-ul Add Story Points to Jira Dashboard
Story points returns null if a ticket is unpointed.
As some systems use unpointed tickets, can you adjust your return line for the story points value to equal:
"return issue.fields[field.id] || 0;" instead? (I've added a default to 0 if unset)