What provider would you like to see added to NPM?
Google Domains DNS.
This is default DNS provider for domains bought from Google Domains.
it provides access token for ACME Challenge.

Have you checked if a certbot plugin exists?
yes, please see below.
https://pypi.org/project/certbot-dns-google-domains/
https://github.com/aaomidi/certbot-dns-google-domains