This solution is been tested with angular 9 and above with ivy.

If you are using older version of angular checkout this article: https://pretagteam.com/question/load-new-modules-dynamically-in-runtime-with-angular-cli-angular-5

Angular 9+ solution:

Before you start you should make sure that your lazy loading components are in a separated module which is not imported in your app module.

First you need to pick a container element and mark it with a template variable to render your lazy component inside it. Something like:

<div #container></div>

And then in your component class you need to query this container using @ViewChild as ViewContainerRef:

@ViewChild('container', {read: ViewContainerRef}) container: ViewContainerRef;

Now you are ready to lazy load your component using the webpack dynamic import. which as by default available in an angular app.

Then you will need to resolve the component factory using the angular ComponentFactoryResolver after you inject it in your component constructor.

And at the end you will just render the component factory in the view reference you have prepared this.container:

lazyLoadAppImageGallery() {
    import('path/to/your/app-image-gallery-component')
      .then(({AppImageGallery}) => {
          const componentFactory = 
          this.componentFactoryResolver.resolveComponentFactory(AppImageGallery);
          const { instance } = this.container.createComponent(componentFactory);
       });
}

After you have rendered your component you might want to pass some data to it. You could use the instance for this:

instance.propertyName = someValue

Checkout this nice article for more infos: https://medium.com/@ckyidr9/lazy-load-feature-modules-without-routing-in-angular-9-ivy-220851cc7751

Update

Here is a working solution with dynamic render on scroll

https://stackblitz.com/edit/angular-ivy-megwrz

If you might use lazy loading with routes, just checkout angular simple documentation

https://angular.io/guide/lazy-loading-ngmodules

You could also combine both solutions. In case you want to dynamically load a component in a lazy loaded module loaded by route.