How to load web applications on runtime?

I'm going through the concept of Micro frontends for the past few days. In Micro frontends, we create bundles of all applications wherein each bundle represents a separate web application and finally we write logic to communicate with these bundles in our base application.

For e.g., let's say we have APP 1, APP 2, and APP 3 are our Micro frontends which we bundled and used in BASE APP.

Is there any way to dynamically load these apps at runtime and without having to create a bundle of individual applications?

I'm aware that we can use iFrame but it doesn't allow cross-origin access to iFrames

from How to load web applications on runtime?