22:3a who said to his servants,

The king of Israel had said to his ministers,
-or-
King Ahab had told his servants/officers,
-or-
Ahab had been talking to his officers

22:3b “Do you not know that Ramoth-gilead is ours,

Verse parts 22:3b-c are a rhetorical question that indicates emphasis. You should indicate this emphasis in the way that is most natural in your language.

“You (plur) do know/realize that Ramoth Gilead is ours(incl.) !
-or-
“As you are well aware, ⌊the city of⌋ Ramoth Gilead should belong to us/Israel.
-or-
about Ramoth in Gilead. Ramoth had ⌊earlier/formerly⌋ been ⌊a city⌋ of/in Israel,

22:3c but we have failed to take it from the hand of the king of Aram?”

Why are we(incl.) doing nothing to recapture/reclaim it from the king of Aram?”
-or-
But we(incl.) are not even trying to take it back from the king of Aram.”
-or-
but the king of Aram/Syria ⌊had conquered/taken it⌋. Ahab wanted to try to get it back ⌊for Israel⌋.

22:3b-c (combined)

“Do you remember that the king of Aram took Ramoth in Gilead from us? Why have we done nothing to get it back?” (New Century Version)

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