Deno (https://deno.com/runtime) is a modern, fast JavaScript runtime (from the originators of Node.js). I'd love to use Render for Deno-based web services instead of Node.js-based web services.

It should be very simple to adapt what you have for Node.js web services and tool it for Deno instead. (Deno is actually simpler than Node.js + npm, a single all-in-one executable that is both the runtime and the package manager, etc.)