Unfortunately, there is no relationship that includes the Pflow Name. The closest I've been able to find is to look at the Action Parameters so you can get the Trigger Number and Work Title.
If you have select access to the GEN tables, you can use the query below to get the details. Hopefully this will help.
select aar.actor ,aar.createdstamp ,xml.PfiTrigger ,coalesce(xml.PfiFlowName,'') as ProcessName ,coalesce(xml.PfiServiceName,'') as ServiceName ,xml.WorkTitle from lmgen.asyncactionrequest aar ,XMLTABLE( '$p/view' passing XMLPARSE(DOCUMENT(BLOB(AAR.ACTIONPARAMETERS))) as "p" COLUMNS PfiTrigger integer path './fields/field[@name="PfiTrigger"]/text()' ,PfiFlowName varchar(20) path './fields/field[@name="FlowName"]/text()' ,PfiServiceName varchar(20) path './fields/field[@name="ServiceName"]/text()' ,WorkTitle varchar(40) path './fields/field[@name="WorkTitle"]/text()' ) as xml
where aar.group='pfi' and aar.implementingclass='PfiTrigger'