This is inspired byhttps://web.dev/blog/json-imports-baseline-newly-available

Modern browserssupport loading JSONs via theimport data from './foo.json' with {type: 'json'} syntax. While this has been promoted as a new baseline, that's still not widely supported.

This PR proposes to add support for a more portable alternative usingimport jsonPromise from './foo.json' instead, with some server-side assisted loader.
On the client-side, one could then use the imported data by awaiting it first (the import returns a Promise):
json = await jsonPromise

Note that we already support importing css via import statements.

Native support forimport './foo.css' with {type: 'css'} exists, but that'seven less available.