Find the equivalent of QFLX in GFS forecast products

 Greetings,I'm trying to run the model offiline driven by GFS forecast products. However, I can not find the equivalent of QFLX in GFS dataset, which is a variable in input met file. I noticed that someone has asked similar questions (https://bb.cgd.ucar.edu/qflx-definition), but there is no "EVAP" variable in GFS dataset. I wonder how to bulid the QFLX from GFS forecast products? Thanks in advance.
 
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