Creating a system of resource planning and work with clients of garment production

That’s a No-go for push notification. There are some basic notifications for android users you can read here

If you search push notifications in this forum you will see it’s a frequently discussed topic. Some use Integromat + twilio or click send, I’ve also seen app script working with WhatsApp. Here is the closest thing to ‘Native’ I’ve seen and it looks like it took a lot work to do it.