"Checklist Content YAML" custom fields accepts and stores data in YAML format. It contains "items" array and each entry contains obligatory "text" property (checklist item text) and optional "checked" property (boolean value for state of the checkbox). It might contain also "description" property for multiline description and "status" property if statuses are enabled.
Here is a valid example:
Default (statused disabled)
items:
- text: '--- Header (title)'
checked: false
- text: 'Item #1'
checked: true
- text: 'Item #2'
checked: false
- text: 'Item #3'
checked: false
And another example with enabled statuses:
Statuses enabled
items:
- text: '---UI tested on'
checked: false
status: open
- text: 'Chrome :santa'
checked: false
status: in progress
- text: Firefox
checked: true
status: done
- text: Edge
checked: true
status: skipped
- text: Safari
checked: true
status: skipped