Automate [Set gain to] or [Adjust Gain by] on timeline clips in Première Pro

Is there a way to automate Set gain to, or Adjust Gain by (or Normalize Max Peak to or Normalize All peaks) to a clip, for example with ExtendScript ?

For example, I want to make a script that adjusts the gain of clip 1, 4, 6 and 8 on track A1 with -7 dB.