report 2D-Axis label syntax

Hello Community,

Does anyone know the syntax off the top of their head to reference a curve channel in Report 2D-Axis label?  I'm trying to label the X-axis with the Waveform x-unit using:

 @@Data.GetChannel("[18]/WindupFFT_tag_5.00").Properties("wf_xunit_string").Value@@

But instead of "[18]/WindupFFT_tag_5.00" , I would like to use a generic channel reference to the curve channel.  Can't seem to make this work using the same syntax that works in a script...

Thank you.