Live Activities Buttons

I want to add a button to my live activity which stops a timer. The docs say to use a URL deep link, which works fine, however it forces the App to open.

I want the timer to stop after the button is pressed and end the live activity without opening my app, like the built in Clock.app timer works.

Is this possible?

It seems that adding buttons is currently only possible in the "extended" dynamic island view, but not in the live activity of the lock screen itself. I would like to see Apple let us add more gestures / interactions though.

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Live Activities Buttons
 
 
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