The value help interface is design to only pass access to one element and attribute into the processing. Although you can export multiple attribute values back, they must be in the same element. So from OVS and DDic this is simply not possible. As suggested you can acomplish this with freely programmed - although the value help listener still is only going to provide access to the source element and attribute. However since this is freely programmed, you have a component usage with which you can do cross component context binding and provide access to whatever data you want.
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