Publish to JSR

Can this be published to JSR too?

Currently when releasing a package depending on this module to JSR, it shows error:

```sh
❯ deno publish
Checking for slow types in the public API...
error[invalid-external-import]: invalid import to a non-JSR 'https' specifier
--> /Users/divyansh/run/mod.ts:1:31
|
1 | import { parseFromJson } from 'https://deno.land/x/import_map@v0.21.0/mod.ts'
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the specifier
|
= hint: replace this import with one from jsr or npm, or vendor the dependency into your package

info: the import was resolved to 'https://deno.land/x/import_map@v0.21.0/mod.ts'
info: this specifier is not allowed to be imported on jsr
info: jsr only supports importing `jsr:`, `npm:`, `data:`, `bun:`, and `node:` specifiers
docs: https://jsr.io/go/invalid-external-import

error: Found 1 problem
```

Also - https://github.com/jsr-io/jsr/discussions/674 🫣

Start with the package entry point and the mod.ts import shown in the report, then run deno publish to reproduce the invalid external import error. Investigate how the deno.land/x/import_map dependency can be made JSR-compatible; done means the package publishes to JSR without that error.

Written by the indexing model from the issue text.