You can import ES6-style JavaScript modules dynamically using await import(filename);.
This works a bit differently from the regular import statement for "default exports". Apparently, you have to do this:
const {default: renamedDefaultExport, namedExport1, namedExport2} = await import("./mymodule.js");
This would be similar to the following:
import renamedDefaultExport, {namedExport1, namedExport2} from "./mymodule.js";