I pray this message shall reach you in good health and iman.
Question: can a person do Dua in Qunut in a mother tongue language in a state of Salaatul Ghufayla and Salaatul witr.
With Salaams and Duas
It won't be considered as Qunut but the prayer and dua is valid. In other words, you wont get the reward of Qunut rather you would get the reward of making a dua alike other duas.