Accordion list and popover component

Hi there!

I desperately turn to you guys, since I tried to create an accordion list in many different ways, even by using Simon’s accordion list tutorial video for Ionic 4, but no result, yet.
Firstly, I kindly ask you whether anybody has ever tried to add an accordion list into a popover component?
Secondly, if yes, can you please what can I do wrong by pulling the data from json file into my component html page?
Thank you guys your advices in advance!!