Enable group topic IDs in telegram notifications

Th Unraid WEBgui only has a bot access token field, but I would like to send the notifications into a group with the bot, to be more exact into a group topic. Is there a way for this? I somehow successfully configured so that the bot sends the notification into the group by first pasting the chat ID into the "Bot access token" field, saving it, then changing it to the API key of the bot. This might be a bot, I don't know the way to enter chat ids though.

I stumpled accros this comment on the forum: https://forums.unraid.net/topic/121801-notification-settings-expose-chatid-in-telegram-agent-configuration/#findComment-1499447

I edited Telegram.sh in /boot/config/plugins/dynamix/notifications/agents and created the topicid file containing the topic ID in /boot/config/plugins/dynamix/telegram as described and it works. It would be nice to be a feature out of the box, and I think it should be accessible from the WEBGUI.

Start by reading the Telegram notification agent at /boot/config/plugins/dynamix/notifications/agents/Telegram.sh and the related WEBGUI notification settings. Compare the existing chat ID and topicid workaround described in the issue, then verify the configuration can be entered through the UI and sends notifications to the selected group topic.