Graph Editor: Output values are not visible in the UI.

[jakethorn]

I have this simple .mtlx file:

<?xml version="1.0"?>
<!-- Generated using ShadingLanguageX (github.com/jakethorn/ShadingLanguageX) -->
<materialx version="1.39">
  <nodedef name="ND_foo" node="foo">
    <output name="out" type="float" default="0.0" />
    <input name="f" type="float" value="0" />
    <output name="f2" type="float" value="0" />
  </nodedef>
  <nodegraph name="NG_foo" nodedef="ND_foo">
    <output name="f2" type="float" value="3" />
    <output name="out" type="float" value="5" />
  </nodegraph>
  <foo name="node1" type="multioutput">
    <input name="f" type="float" value="1" />
  </foo>
  <add name="y" type="float">
    <input name="in1" type="float" nodename="node1" output="out" />
    <input name="in2" type="float" nodename="node1" output="f2" />
  </add>
</materialx>

I can't find a way to see the value of the NG_foo outputs in the Graph Editor: