Instead of embedding something, you might prefer to retreive data from a third party with the parameter passed in that dynamic item page. You might hire a velo coder from marketplace or send us a request.
Also there are some samples which state that it is possible with some code. Check below links.
https://www.wix.com/velo/forum/coding-with-velo/dynamic-page-with-html-embedded-with-url-from-database
https://www.wix.com/velo/forum/coding-with-velo/dynamic-page-with-embedded-iframe