Yes. You have to edit the "Sprint Burndown.rdl" file in your process template (it's in the reports folder). Particularly, you have to change this field:
<Field Name="Remaining_Work">
<DataField><?xml version="1.0" encoding="utf-8"?><Field xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="Measure" UniqueName="[Measures].[Microsoft_VSTS_Scheduling_RemainingWork]" /></DataField>
<rd:TypeName>System.Int32</rd:TypeName>
</Field>
To reference the effort point field. This isn't the only change that you'll need to make to that file to get this to work (the MEASURE in the SELECT statement also needs to be altered), but that should at least get you started.