Running app with a mph option instead of just pace for tracking laps?

I (27f) am trying to get into running for the first time in my life. I was using the runna app and I really like where it gives ‘laps’ for walking then running with audio cues and how fast I’m supposed to be going. But I need a slower build up than what it offers. (I tried to stick with the program it laid out but my heart feels like it may simply explode). I also exclusively run on treadmill right now.

I’ve downloaded a handful of other apps but all of them are formulated to track pace instead of outlining mph. I run on treadmill so mph is far more useful information to me rather than pace.

I would love to have something that I could set several ‘laps’ at different mph’s where it would announce in my headphones when laps were starting. If there was some connectivity to my Apple Watch that would be nice too.

Any recommendations for apps would be very appreciated.