Not available in next-gen projects. Please see the details here.
To use this functionality you need to set-up "Checklists" custom field, or "Smart Checklist Progress". It depends on what main criteria you'd like to search for.
Smart Checklist supports JQL as an approach for searching checklist items values and checklist progress.
If you set up "Checklists" (multi-line text field) and "Smart Checklist Progress" (single-line text field) which are both custom fields - you can easily apply all JQL search patterns.
Search examples
- To search for issues with opened checklists (not all checklist items completed).
- Type in JQL: "Smart Checklist Progress" ~ "-Done"
- To search for issues with ALL completed checklists
- Type in JQL: "Smart Checklist Progress" ~ "Done"
NB! At this moment, searching for Jira issues where a specific checklist item has completed/ incompleted status is unavailable. This happens due to the following limitation: Jira does not index the special character of - and +
Special characters
+ - & | ! ( ) { } [ ] ^ ~ * ? \ :
Special characters aren't stored in the index, which means you can't search for them. The index only keeps text and numbers, so searching for "\\[Jira Software\\]" and "Jira Software" will have the same effect - escaped special characters ([]) will be ignored in the search.
Source: https://confluence.atlassian.com/jirasoftwareserver0712/search-syntax-for-text-fields-959315338.html