What is the supplication while prostrating? And is it permissible to say: "O Allah, forgive our sins and our transgressions" while prostrating?

It is permissible to make any supplication during prostration, for the Prophet, peace and blessings be upon him, said: "The closest a servant is to his Lord is while he is prostrating, so increase in supplication." The Prophet, peace and blessings be upon him, used to frequently say in his bowing and prostration: "Glorified be You, O Allah, our Lord, and with Your praise; O Allah, forgive me."