Yes it is. Make your AppIntent conform to the LiveActivityStartingIntent and call your start live activity logic in the perform method.
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I think I found a solution but it's not working.
Text(.now, format:.timer(countingDownIn: Date.now..<Date.now.addingTimeInterval(120),
showsHours: true,
maxFieldCount: 2,
maxPrecision: .seconds(60))
)
This will display "2 minutes" but after waiting over a minute it never updates to "1 minute" This is new to iOS18. I will submit a bug.