Hi Ronak,
The demo is available in the download package, too. It uses a custom editor defined in a native HTMLTemplateElement defined in template tag. To use that approach HTMLTemplateElement should be outside of the Angular component. It is also possible to use Angular component within Grid column and this approach is described in this tutorial: https://www.htmlelements.com/docs/angular-component-grid-column/
Best regards,
Peter Stoev
Smart UI Team