If you want to build your own spatially-aware iOS app that can range and estimate distance/angle to other, non-Apple UWB devices, e.g. beacons you just need to make sure these other devices have the latest UWB chip that is "interoperable" with Apple U1.
Apple has published here: https://developer.apple.com/nearby-interaction/ in the FAQ section the list of chip manufacturers that have compatible radios with U1.
There are many companies offering Dev Kits that have these new, compatible chips already integrated.
Google "UWB Dev Kit" or "UWB Beacons" and get some of these devices. They typically come with SDK full of examples, so it should be pretty simple to integrate with your app.
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