Is it permissible to write a notarized pledge at the Real Estate Registry concerning obligations towards children after agreeing to separation?

The maintenance of children is obligatory upon the father according to the Qur'an, Sunnah (definition), and scholarly consensus. Allah the Almighty says: (Then if they suckle for you, give them their due payment). And the Prophet, peace and blessings be upon him, said to Hind: "Take what suffices you and your child, in a reasonable manner." The people of knowledge have unanimously agreed on the obligation of a person's maintenance of their young children who have no wealth. Writing a covenant between the spouses to document this maintenance is permissible if they agree upon it, as a guarantee of the children's right, provided that the documentation is specifically for the children's maintenance, clothing, and housing.