Parallel
2 Chronicles 27:7
Swete's Septuagint · Berean Standard Bible
καὶ κατίσχυσεν Ἰωαθάμ, ὅτι ἡτοίμασεν τὰς ὁδοὺς αὐτοῦ ἔναντι Κυρίου εοῦ αὐτοῦ.
As for the rest of the acts of Jotham, along with all his wars and his ways, they are indeed written in the Book of the Kings of Israel and Judah.