I was wondering if there is any way to use TAGS to gain access to metadata from Twitter Cards, ie text for summary cards or embedded images for image cards.
unfortunately it doesn’t look like this data is contained in the api response. The markup used to generate these will be in the source site as part of the metadata https://dev.twitter.com/cards/overview (this is far beyond the scope of TAGS but you might be able to extra the url and somehow process using another tool)