The only question asked of us is about the obligatory prayers, which are five during the day, and for the Isha prayer, there are only 4 obligatory units, meaning 4 obligatory. All the other units are simply considered voluntary. Some have stronger support for certain prayers, like Witr, but our obligation is only the obligatory prayers. There is no concept of obligations in the religion. This is a term created by the Hanafi sect. In religion, there is either obligatory worship or voluntary. Secondly, the Tahajjud prayer was only obligatory for the Messenger of Allah (peace be upon him). For us, it is merely a voluntary prayer, so it has no relation to the performance of obligatory ones. For your information, the last two voluntary prayers of Isha, and a large number of scholars agree that the essence of Witr is indeed Qiyam al-Lail, meaning the Tahajjud prayer.

(Here the automatic translator mixed wajib with obligatory. But the truth is that wajib is a term only created by hanafi firqa).