We have the Jira funcionality "Releases" that allows us to create releases and then use those releases to inform the field "fixVersion/s" in different ítems (Epics, Stories, etc.).

How to create a JQL query to obtain the list of "Releases"?
Which issuetype or ítem type should we use to find the existing "Releases" we have already created?
We would like to obtain that list of "Releases" and be able to export it to Excel (for instance) or include it in a gadget within a Dashboard.
Which fields or attributes has a "Release" item, so that we can refine the JQL filter to obtain the "Releases" of our insterest, for example, those having a certain tag in its name?
Thanks in advance for any help!