Now there is no way to use Markdown formatting when scheduling a reply via the support ticket escalation rules system.
When creating such a rule - the Markdown formatting will not work.
How to check:
1. Please create a new support ticket escalation rule.
2. Set the support ticket escalation rule to send a mail to the customer via the "Add Reply" option within the support ticket escalation rules setting.
3. Add to the scheduled reply some formatting with markdown code.
4. After the scheduled mail is send - check if the customer got the mail with the intended formatting.