How to import relative JSR module from import map

Problem

I expect the following to work, but it does not:

{
  "imports": {
    "@std/path/": "jsr:@std/path/posix/",
  }
}

{
  "imports": {
    "@std/path/": "jsr:@std/path/posix/",
  }
}

{
  "imports": {
    "@std/path/": "jsr:@std/path/posix/",
  }
}

{
  "imports": {
    "@std/path/": "jsr:@std/path/posix/",
  }
}

import { basename } from "@std/path/posix/basename"; // nope!

import { basename } from "@std/path/posix/basename"; // nope!

import { basename } from "@std/path/posix/basename"; // nope!

import { basename } from "@std/path/posix/basename"; // nope!

What are others doing in this scenario? Simply not using import maps?