For Easy Agile Roadmaps Versions 3.2 through to 3.3.7, it is possible to search for scheduled issues on the roadmap using JQL / Advanced Search.

Examples

Search	JQL query
Find all scheduled issues	issue.property[EA-schedules].tags is not empty
Find all issues scheduled in Q3 2018	issue.property[EA-schedules].tags ~ "2018_3"

As of Easy Agile Roadmaps 4.0, issue scheduled on the Roadmap can be synced with the Jira Start and Due Date fields.

Issues scheduled on the Roadmap are then searchable via JQL using their respective Start and Due Date names.

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