Apple watch function to mute phone calls

How can I use my apple watch to unmute phone calls? I was calling an office that it's really hard to get someone on the line. I muted my phone while waiting, so I could complete other tasks and walked away wearing my apple watch and using my AirPods pro. Then while I was away from my phone, the office I was calling answered, but my iPhone was muted, and I was away from it, so I had to run back to where my iPhone was to unmute it, and by the time I got there and physically unmuted the call on the iPhone screen, the office I was calling, hanged up and then I had to call back and wait another 15-20 minutes on the line to get to someone.

I need to learn how to unmute / mute my iPhone call using my apple watch! What it seems to be a "seamless" and "natural" action has become a burden and an inconvenience. I am sure, someone though of this already, I just can't find how to complete this simple operational task, using either my apple watch or the AirPods pro for what matters.