Team

Select only one board as a data source with additional filters due to your Jira Setup if you want to analyze metrics on the team level:

Cross-team

To aggregate several teams as one, select two boards and more.

Screenshot with JQL filter

If sprints are not synced by start and/or date, use parallel gap:

If sprints are synced, you see them under one section:

Individual metrics are aggregated using any Assignee field in Jira. The chart counts only issues assigned to someone.