Call another github action like an async function call

Describe the enhancement
Consider development of a composite GitHub action using the javascript toolkit. In that case, the steps would involve also calling other existing actions as if run from the action yaml.

Code Snippet
Something along the lines of:

import * as core from '@actions/core';

async function run() {
  await core.callAction("<name", {input_arg1: "v1", input_arg2: "v2", ...})

  // access any output from this action call by calling ??
}

Additional information
The idea is to be able to specify a composite action entirely in javascript. Given that a composite action is treated like a regular action, is there a way to create composite actions using the javascript SDK?

Start with the @actions/core JavaScript toolkit and the GitHub Actions composite-action model described in the issue. Determine whether one action can invoke another programmatically and how its outputs would be exposed; done means a clearly scoped, supported approach or implementation plan.