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Use case
Count the number of subtasks, which are open (in status category To Do or In Progress).
Configuration
Create a new Calculated Number Field (by JWT) custom field and name it properly.
Providing a description will help you to identify what the custom field does but this step is optional
Parser expression
Add the following expression:
count(filterByPredicate(subtasks(), ^%{00144} = "To Do" OR ^%{00144} = "In Progress"))
Once configured and added to an issue screen, the result will look like this:
If you still have questions, feel free to refer to our support team.