Is reciting the last verses of Surat Al-Baqarah and the verse, "Our Lord, grant us from among our wives and offspring comfort to our eyes and make us leaders of the righteous," considered a supplication after the 'Isha prayer?

The supplication with the description mentioned in the question is not based on any Sharia evidence. The prescribed invocations (dhikr) after the five daily prayers do not include specific verses. However, verses from the end of Surat Al-Baqarah and Al-Furqan include supplications that are permissible at all times. It is authentically reported in Sahih Muslim that the Prophet, peace and blessings be upon him, said: Allah Almighty said, "I have done so," after the verses at the end of Surat Al-Baqarah. There is also a Hadith regarding the virtue of reciting the end of Surat Al-Baqarah at any time, as the Messenger of Allah, peace and blessings be upon him, said: "Whoever recites the two verses from the end of Surat Al-Baqarah at night, they will suffice him." It is recommended to verify the authenticity of invocations by referring to the sound Sunnah.