Import data from local JSON

Hi all,

after exploring some guide, i still didn’t figure out the full process of importing data from JSON to my app using ts.
i tried this guide:

but all i get is a list full with buttons.

I’m trying to create a list of contact members with photo and some details, like phone number and address.

can someone please explain the full process and to be as specific as possible (I’m very new) and attached an example JSON file.

Thanks in advance to the helper.