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If you can't see it you can't, I think. I see the energy as red or pink or any other color, mostly those and glowing green, sometimes black, there are different forms. But I think in Qi Gong they only do red color.
When activated and compressed to a high degree is starts building upward into a spiral. This happened with my martial arts gong recently.

Maybe you can try sitting in burmese lotus and holding the pran mudra.
https://yoga.lovetoknow.com/yoga-pose-gallery/pran-mudra
Close your eyes and just observe, at least this increases the flow. If you can see it, it should be easier.