Safari Extensions for iOS - where is it?

According to https://developer.apple.com/safari/extensions/ I can "Enhance and customize the web browsing experience on Mac, iPhone, and iPad with Safari Extensions".

Sounds great so far.

I am looking for information on how I can can create a Safari Extension on iOS, and I have come up blank.

All the docs make no mention of iOS, just MacOS.

The sample code at https://developer.apple.com/documentation/safariservices/safari_web_extensions/messaging_a_web_extension_s_native_app?language=objc is for MacOS only.

Xcode project templates list "Safari Extension App", but only under MacOS.

I'm lost, are WebExtentions / Safari Extensions supported on iOS, and if so, how?

There are apps in the iPhone App Store that claim to integrate with Safari. What technology are they using?

Safari Extensions for iOS - where is it?
 
 
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