Finely chop the konjac.
Combine the measured amounts of red pepper powder, doenjang, low-sugar sweetener, brewed vinegar, garlic, chopped green onion, and soy sauce in a bowl and mix well.
Add the chopped konjac and mix thoroughly.
Place a pan over low heat, add the mixture, and simmer while stirring for 10 minutes.
Let the finished low-sugar gochujang cool, transfer to a container, and store.