This weekend I took some videos of Theia doing intervals. Here is one of her doing a 12 minute interval at a floor of 210 watts - 1 minute standing and 1 minute seated. Notice the power control within each minute and when changing from standing to seated to standing.
Here is a zoom in of the power file. The one big drop there was because of a stop/traffic. Notice how Theia keeps the power floor close to/above the target (black line). Cadence changes between seated/standing is the blue line.
More on standing form: