Yes, it is recommended to recite the chapters "Al-Kafirun" and "Al-Ikhlas" in the Sunnah of Fajr and in the Sunnah of Maghrib, and this has been established in the authentic Sunnah from the Prophet: From Abu Huraira, the Messenger of Allah said: "He recited in the two rak'ahs of Fajr {Say, O disbelievers} and {Say, He is Allah, [Who is] One}." Narrated by Muslim (726). And from Ibn Umar, may Allah be pleased with them both, he said: "I observed the Messenger of Allah twenty times reciting in the two rak'ahs after Maghrib, and in the two rak'ahs before Fajr: {Say, O disbelievers} and {Say, He is Allah, [Who is] One}." Narrated by Al-Nasa'i (992).