I googled by keyword “Shadow Dom Protractor” and found the following artile:
I haven’t read it at all but the title tells me that it is possible to test Web pages with multilevel Shadow DOM elements using Protractor.
On the other hand, one day @discover.selenium posted following discussions:
These discussions, I suppose, indicates somehow it is possible for Katalon user to utilize the Protractor assets (JavaScript libraries) to test Angular-based web pages with multilevel Shadow DOM. I may be wrong. I haven’t studied this issue at all. But there seem to be a research path to go through and see.