"type": "custom" and its custom_type value.
This page lists every PNLight component that you can add to a Remote UI configuration.
Circular loader
pnlight.circular_loader displays a circular loading indicator in your Remote UI screen. Use it while your app or the screen loads content.
Set the component size with its
width and height fields. Use { "type": "wrap_content" } for either dimension when you want the loader to use its intrinsic size.