I have an ES6 module right.mjs. Executing it as a parameter to node works well:
$ node --version
v8.10.0
$ node --experimental-modu
It is possible in Node v14, but you need to use the import function, rather than the import statement.
$ node
Welcome to Node.js v14.4.0.
Type ".help" for more information.
> let myModule;
undefined
> import("./my-module.js").then(module => { myModule = module });
Promise { }
> myModule.foo();
"bar"