...
For example, the name value “Delayed” of the Traffic Lights field “Timeline” has returned the following results:
...
Advanced Issue Search & JQL
Issues with creating traffic lights field values can also be searched via JQL queries.
Supported operators: =, !=, is not, is, not in, in
Supported keywords: ORDER BY (ASC / DESC), EMPTY
The syntax format: FieldName = OptionValue OR Timeline = Delayed
...