Hi @SGH ,
As per my knowledge, there is no OOB way to export owner details and the source of workload by the SharePoint site. You can get owner details via accessing Microsoft 365 admin center -> Users -> Active users -> Export users. To retrieve associated SharePoint site URL for Microsoft Teams, you can achieve it using Graph/REST API, Powershell and etc. Reference: https://www.syskit.com/blog/retrieve-associated-sharepoint-site-url-for-microsoft-teams/.
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Yes, I could repro on my end. This way seems to be outdated. Try other ways in that article.