iControl REST filter from subcollections

I dont think there's an option for this. from the guide its application for partition alone. Refer below,

Parameter Description
Specifies an administrative partition to query for a result set. This parameter filters
the result set by partition name and does not fully implement the corresponding
$filter
OData query parameter. The asm module fully implements the OData query
parameter

But as a workaround, you can use the jq and do the select filter to extract the pool name for a given node name.