selectOneRadio set value as index of selected item

selectOneRadio set value as index of selected item

I want my p:selectOneRadio to have value of index of selected radio button.
For example, rows in p:dataTable can be aware of their index using
attribute rowIndexVar="rowIndex".
So my question is, can individual radio buttons in p:selectOneRadio be
aware of their index? Then i could do something like this
<p:selectOneRadio itemIndexVar="index" value="#{bean.selectedIndex}">
<f:selectItems value="#{bean.items}" var="item" itemValue="#{index}"
itemLabel="#{item.label}" />
</p:selectOneRadio>