There seems to be a JavaScript API that might be used
https://opensource.contentauthenticity.org/docs/js-sdk/getting-started/overview
https://github.com/contentauth/c2pa-js/tree/main/examples/esm-imports
Not read it, just browsed the html demo but it seems to return an array of objects
There are apps for iOS, Mac OS and Android to embed the content credentials - Proofmode
It seems a bit complicated, it took me long enough to get JSON into my thick head!