what does the `relation` field do to link a webapp with and out-of-scope domain?

[diekus]

Hola. According to the documentation in web.dev, to check out of scope for a PWA there should be an assetlinks.json file as described here. What is not clear to me is what does the relation field have to do in the out of scope scenario, is it required and if so what is the possible values in this case to link an out of scope domain to the origin of the PWA.

I'm trying to fix this for desktop platforms, but there doesn't seem to be any documentation of what does that value do.

// Served from https://app.example.com/.well-known/assetlinks.json [ { "relation": ["delegate_permission/common.query_webapk"], "target": { "namespace": "web", "site": "https://www.example.com/manifest.json" } } ]

[diekus]

friendly ping @rayankans @petele @tomayac

[tomayac]

Let's ping @rayankans as the Android implementer.