Searches issues linked to the given subquery. Additionally you can further refine your query by specifying a link type.
Note: Since you need to enclose the provided subquery using doble quotes, you must to escape any doble quotes using in the subquery by preceding a backslash after the double quotes, alternatively you can use a single quote in some cases.
Let's see an example...
This will not work
issue IN linkedIssuesOf("status = "Under Review" and type = Bug")
Searches issues linked to Bug that are currently being reviewing
This will work perfectly
issue IN linkedIssuesOf("status = \"Under Review\" and type = Bug")
Searches issues linked to Bug that are currently being reviewing
issue IN linkedIssuesOf("status = 'Under Review' and type = Bug")
Searches issues linked to Bug that are currently being reviewing