Along with iOS 12, Apple released a new app called Shortcuts. It is not preinstalled as far as I know. I think they got it via acquisition. There’s a bunch of new hooks that app makers can/must use to integrate with it, so not everything is supported.

It’s basically IFTTT for iOS, and you can assign phrases in Siri to it.

https://support.apple.com/guide/shortcuts/welcome/ios