The following custom field type is provided by Issue Picker for Jira:

[cwx] Issue Picker CustomField

This custom field type can be used to:

• Display all results of a JQL query and displays a table of specified fields for each matching issue.
• Pick for single and multiple issues.
• Create links to picked issues.
• Copy the values of a set of custom fields from a picked issue to the current issue. The copied values are stored in the corresponding custom fields so there is no need for a field mapping.
• Aggregate values of custom fields in a table.

Before you can use the "[cwx] Issue Picker CustomField", see here:

• How to configure the Issue Picker custom field