Jira issue mentiones
Just like with a JIRA issue, you can mention any desired JIRA issue within your task content. While in edit mode, enter the issue key in capital letters (for example, KAN-1) anywhere in your task content. When you save the task, if the entered issue key is valid, Tick will render the issue as a link to the issue on JIRA, and will also visually indicate the type of issue (issue, epic, subtask, etc.) and its status (to do, in progress, done, etc.). Otherwise, it will render it as a string.
Examples