Configure a deno.json to disregard package.json?

I have a few projects where a small Deno backend serves APIs for a classic Vite frontend (react, eslint, typescript, etc).
So I have my backend dependencies in deno.jsondeno.json while all of the numerous toolchain deps are in package.jsonpackage.json.

This has been a pretty clean setup, however Deno has the annoying habit of also reading package.jsonpackage.json and adding stuff from it to deno.lockdeno.lock. Recently I've also begun using JSR packages in package.jsonpackage.json for my frontend app, which makes Deno crash out.

I've started setting DENO_NO_PACKAGE_JSON=1DENO_NO_PACKAGE_JSON=1 in my CI and terminals to address this. But I can't see how to set it more properly in deno.jsondeno.json so it always applies. And now I'm seeing that the deno LSP is starting to complain too! I don't know how to set DENO_NO_PACKAGE_JSON=1DENO_NO_PACKAGE_JSON=1 on the LSP. So when I try importing an npm module in Deno, it complaints that the package.jsonpackage.json is using a JSR module.

Any advice on using package.jsonpackage.json and deno.jsondeno.json independently in the same repo?