Advanced Search Roadmap Dates
As of version Easy Agile Roadmaps 3.2, released in July 2018, it is possible to search for scheduled issues on the roadmap via JQL / Advanced Search.
Find all scheduled issues
JQL: issue.property[EA-schedules].tags is not empty
Find all issues scheduled in Q3 2018
JQL: issue.property[EA-schedules].tags ~ "2018_3"