init.lua

function toggleZoomMute()
  local zoom = hs.appfinder.appFromName("zoom.us")

  if (zoom == nil) then
    return
  end

  local unmute = {"Meeting", "Unmute Audio"}
  local mute = {"Meeting", "Mute Audio"}

  if (zoom:findMenuItem(mute)) then
    zoom:selectMenuItem(mute)
    hs.alert.show("Zoom Muted")
  elseif (zoom:findMenuItem(unmute)) then
    zoom:selectMenuItem(unmute)
    hs.alert.show("Zoom Unmuted")
  end
end

hs.hotkey.bind({"cmd", "shift"}, "A", function() 
  toggleZoomMute()
end)