Actually the meter reset is not a standard capability and it’s device specific, so is the display about how long the meter has been running. You would need to contact the DTH developer to add support for resetting meters and more custom controls. Here are examples of resetting the meter with the new ST app:
[RELEASE] Official Monoprice Plugin Power Monitor Device Handler
Having said that ST could definitely show how long it’s been running until the last time it reported 0, it’s something they can build in to the graph plugin.