I am trying to use aosd_cat to visually label each accessibility element on the linux desktop. I can spawn this command synchronously no issue, but cannot find a way to spawn this command in many times parallel to visualize every element at once (i.e. without blocking until the previous visualization finishes)

function paintScreen() {
  try {
    const cancelHandle = Gio.Cancellable.new();
    const proc = Gio.Subprocess.new(["aosd_cat"], Gio.SubprocessFlags.STDIN_PIPE);
    proc.communicate_utf8("LABEL_NAME", cancelHandle);
    
  } catch (e) {
    logError(e);
  }
}

I have tried using .communicate_async() or .wait_async() but neither seems to work and don’t spawn the command, even if I await it.

In Python I would use threadpoolexecutor or something similar, but that is obviously not an option here.

I am not sure how to fix this. I would also like a solution that continues to let me pass stdin to the aosd_cat command. You can assume all my other code works fine.
I am compiling from TS to GJS using ts-for-gir if it matters

Thank you very much