John Gill Commentary 1 Kings 22:45

"Now the rest of the acts of Jehoshaphat, and his might that he showed, and how he warred, are they not written in the book of the chronicles of the kings of Judah?" — 1 Kings 22:45 (ASV)

And all the rest of the acts of Jehoshaphat, and all his might
that he showed, and all his wars, are they not written in the book
of the Chronicles of the kings of Israel ?
] Many of them are recorded in the canonical book of Scripture, which bears the name of Chronicles; and more might be in this referred to, out of which might be taken what God has thought fit to transmit to future times; see (2 Chronicles 17:1-20:37) .