I also tried the following rule syntax with from but without collect ( ) :

rule "Explode Globals"
    ruleflow-group "Data Prep"
    when
        $market : Market() from request.requestObjects.values
        $series : CandleSeries() from $market.candleSeries
    then
        insert ( $series );
        insert ( $market );
       
end

At runtime I get an exception: org.mvel.PropertyAccessException: unable to resolve property: values