Is “Yue's mother tattooed characters on his back,精忠报国” true?

The 'History of Song: Biography of Yue Fei' records that when Yue Fei was on trial, he 'tore his clothes to show his back to the examiner, where there were four large characters, '尽忠报国', deeply embedded in the skin.' The official history clearly records the back tattoo, but it does not specify that it was done by his mother, and the characters are '尽忠' rather than the later popular '精忠'. Based on this real historical detail, 'The Complete Story of Yue Fei' created the classic episode of 'Yue's mother tattooing' to strengthen the ethical conflict between filial piety and loyalty.