Not Familiar with JQL? Here's a Quick Shortcut
If you're not comfortable writing JQL queries manually, there's an easy workaround using Jira's built-in search interface:
Navigate to Filters → Search issues.

Use the Basic mode to define your criteria using the dropdowns and fields.

Once your results look right, switch to JQL mode and voila, your query is complete! Jira will automatically convert your selections into a JQL query.

Copy that JQL and paste it into the calendar view in our app.
This lets you take full advantage of JQL without needing to write it from scratch.