You are not clear on what Terminal you are referring to… some BT/BLE Terminal App on the phone or Blynk’s terminal widget in Blynk App, or the IDE Serial Monitor/ PC Terminal app… etc.
If referencing sending Serial data to the Blynk terminal (after all this is the Blynk forum) then there have been a few topics on similar attempts… Tricky it is Search this forum for keywords like Serial Terminal, Debug, etc.
Search this forum for keywords like Serial Terminal, Debug, etc.