If I only have parametric EQ ?

Parametric EQ are also called IIR filters. If you have a standard equaliser with parametric filters, you just do a normal measurement without EQ.
When you get your results and if you choose “measure and correct”, the directory named “correction” contains xyLrew.wav, xyRrew.wav, aso…, files.
If you have REW installed, import those xyZrew.wav with file/import/import audio data.
Depending on your brand/model of equaliser, use the function EQ of REW to ajust your corrections.
For the EQ target in REW, try to copy the target calculated by loudspeakers.audio