You can manually trigger the human takeover by creating a new Dialogflow Intent with the following | Custom Payload response:
{ "human-takeover": true }.
The manual takeover automatically
notify agents via email and leave the conversation marked as unread.
To manually send a human take over request use the chips rich message with ID Cb-human-takeover. Ex. [chips id="sb-human-takeover" options="Human support,Cancel" message=""].