If you're not comfortable writing JQL queries manually, there's an easy workaround using Jira's built-in search interface:
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Navigate to Filters → Search issues.
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Use the Basic mode to define your criteria using the dropdowns and fields.
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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.
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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.