Although there seems no out of the box way to configure a report to show up in "Team" related reports section, you could use the SDK to append team entity into the list of entities the report is configured to show up (Related Record Types).
"ReportEntity" entity stores the references to the list of all the related record types the report is configured to show up under.
var reportEntity = new ReportEntity()
{
ReportId = new CrmEntityReference(Report.EntityLogicalName, reportId), //the ID of the report you want to show up in "Team" areas
ObjectTypeCode = "team"
};
organizationService.Create(reportEntity);
I have verified and the report does show up under "Team" although the actual report "Related Record Types" shows an empty string followed by a ";" which tells me UI is not configured to recognize team as a related record type.