Is it true that the word "khair" (good) in the phrase "Jazakallahu khairan" (May Allah reward you with good) refers to a valley in Paradise?

The Hadith narrated by Al-Tirmidhi from Usamah ibn Zayd (may Allah be pleased with them both) states that the Messenger of Allah (peace be upon him) said: "Whoever has a favor done for him and says to the doer: 'Jazakallahu Khairan' (May Allah reward you with goodness), he has indeed praised him sufficiently."

The word "Khairan" (goodness) has been interpreted as absolute goodness, encompassing the good of this world and the Hereafter. Undoubtedly, Paradise is among the greatest forms of goodness. None of the commentators of the Hadith mentioned that "Khairan" refers to a valley in Paradise. Al-Mubarakfuri, in his book Tuhfat al-Ahwadhi, interpreted it as a good reward, or the good of this world and the Hereafter.