Scaling images in Teams popup modal

Hie,

I'm using the Share To Teams button on a webpage, using this documentation https://docs.microsoft.com/en-gb/microsoftteams/platform/concepts/build-and-test/share-to-teams#share-to-teams-for-education

When I press the button and the popup/preview modal is displayed, the image gets cropped.

See original-image and popup-image in the attachments.

My first question is whether it's possible or not to pass metadata to scale the image differently?

Also, instead of using the popup-image that gets displayed, is it possible to show the page that the link goes to as an image in the popup module?

Thanks in advance!