I am using Jira cloud and thus I couldn't get the REST API Browser add on to develop my query.
I had created another question, but it was flagged as SPAM because I tried to insert the original answer I found here to bestow credit where credit is due.
I have found on google the following very nice jql that returns all the epics from a given project.
I'm doing a trial and error approach to get something like the JSON structure bellow, my current iteration is:
issues : [
Thanks in advance
You can actually get epics, stories and issues in one Rest Api Call to /jira/rest/api/2/search. Then you can work on the received json and get all data you need. Sprint is just a cutsom field. Epic Link is also a custom field. Stories connected to issues by links. You can get all the information from the return JSON and process it.
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