So, the string 'hex' translates to \x686578 in a bytea field.

\x68 = decimal 104 = 'h'; \x65 = decimal 101 = 'e'; \x78 = decimal 120 = 'x'

Here's a short Python function to translate hex ascii to a character string:

def hexToStr(hexString: str) -> str:
    # Convert hex string to bytes
    bytesObject: bytes = bytes.fromhex(hexString)
    # Decode bytes to string
    asciiString: str = bytesObject.decode("ASCII")
    return asciiString

if __name__ == "__main__":
  hex_string = "686578"  # hexadecimal representation of the ASCII codes for the string 'hex'
  print(hexToStr(hex_string))
     
# output: hex

Rewrite the above "__main__" part to open a database, select whatever, loop through the results, translate the field(s) in question, and perform whatever output you like.