The Herzum Approval app provides a large set of useful JQL functions to be used with JlRA's advanced searching.
In order to run a search you can directly type the JQL function within the Jira Search Navigator
or alternatively you can click on the Approval button available on the Jira menu top bar and chose one of the available option into the APPROVAL FILTERS section.
This way, you are redirected on the Jira Search Navigator and you can customize, when required, the input's parameter at your convenience.
The customer requirement has been satisfied through the following JQL functions: