Is it permissible to make the intention to fast all the days of Ramadan at once before Tarawih prayer?

The place of intention (niyyah) is the heart, and it is not prescribed to utter it verbally. It has not been reported that the Prophet (peace be upon him) or his Companions renewed the intention every night for the Ramadan fast. The intention for the entire month at its beginning is sufficient for what requires continuity, and this is the view of the Maliki school. However, renewing the intention every night without vocalizing it is desirable, to avoid a difference of opinion.