Installation of Synology Chat

Hello everyone,
I am a newbie in HA world. I started my migration from Jeedom the HA a couple of days ago.
I would like to integrate Synology Chat, I used it with Jeedom and I like this option to receive notification, with option of history.
I followed the documentation ton integrate Synology Chat by modifing the configuration.yaml file. I already have a webhook and I know that it works because Jeedom uses it too.
I can see Synology Chat in my integrations, but I don’t have any entities.

This is my yaml:

notify:
  - platform: synology_chat
    name: HA_General
    verify_ssl: false
    resource: https://xxxx

I tried with/without verify_ssl, to reboot HA, etc…
Any advice?