Hi @Roopak Sahoo,
Unfortunately, you cannot directly access a SharePoint site or its owners if you don't already have access permissions. Power Automate requires you to have the necessary permissions to perform actions on SharePoint sites and lists.
For your needs, Microsoft Graph may be a better fit to implement. You just need to create the application in your Azure AD and give Sites.FullControl.All permission to the application and generate the appropriate access tokens to manipulate SharePoint sites in bulk via Graph API.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.