Python3 script containing a Frida script (as a string) with a child-gating feature, designed to run after device.resume(). Tested on iOS 16.3.1.

sample.py

#!/usr/bin/env python3

import signal
import sys

import _frida
import frida
from frida.core import Session, Script, Device, ScriptMessage


def signal_handler(sig, frame):
    print("Interrupted by Ctrl-C, stopping...")
    sys.exit(0)


signal.signal(signal.SIGINT, signal_handler)


def _on_message(message: ScriptMessage, data):
    print(message)


def _on_child_added(child: _frida.Child):
    script = None
    if 'appex' in child.path:
        session: Session = device.attach(child.pid)
        script: Script = session.create_script(
            """\
recv('resume', function onMessage(message) {
  // Your code to be executed after receiving the 'resume' message
  const NSBundle = ObjC.classes.NSBundle;
  const NSURL = ObjC.classes.NSURL;
  send(NSBundle.bundleWithURL_(NSURL.fileURLWithPath_isDirectory_('/Applications/AppStore.app/', true)).objectForInfoDictionaryKey_('CFBundleIdentifier').toString());
})
"""
        )
        script.on("message", _on_message)
        script.load()
    device.resume(child.pid)
    if 'appex' in child.path:
        script.post({"type": "resume"})


device: Device = frida.get_usb_device()
device.on("child-added", _on_child_added)
device.attach(1).enable_child_gating()

while True:
    signal.pause()