Is there any Sunnah Ratib before Isha prayer?

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

There is no Sunnah Ratiba (a given Sunnah prayer linked to a given obligatory one) before Isha.  But it is likeable to pray two Rak’ah before Isha as the Prophet (Sallallahu Alaihi wa Sallam) said: "Between each two Adhan (Adhan and Iqamah) there should be a prayer."  [Reported by Imams Al Bukhari and Muslim].

You may also pray as many Nawafil (supererogatory prayers) between Maghrib and Isha as you wish.

Al Dhahbi mentioned while talking about Abu Uthman Al Nahdi that the latter used to pray 100 Rak’ah between Maghrib and Isha.

Allah knows best.