You can use applications like MacroDroid to send notifications from your phone to KOReader using this plugin.
Plugin's menu items are under Settings > Network.
Tested with an Android phone (using MacroDroid )
To send notifications, both devices must be connected to the same network.
Details are in the repository's README.
You can download the plugin from this repo:
https://github.com/omer-faruq/notifi...tener.koplugin