How many points are Jacks and Queens worth?
Either 10 each or 11 and 12, depending on which rules set you use.
Wiki says it's played with cards numbered 1 through 13, sometimes with a dedicated deck and sometimes with a standard deck, indicating that the J and Q are worth 11 and 12 respectively:

The game uses a dedicated deck of cards with each suit numbered from 1 to 13, ... Cabo can also be played with a standard playing card deck, and goes under names including Cambio,...

The reference it gives there for &quot;standard deck Cabo&quot; is this one, which says

Jack is worth 11
Queen is worth 12
King of diamonds (the one-eyed king) is worth 0 points
The other three kings are worth 13 points

This set of rules also gives the 11 and 12 values:

Points correspond almost directly with the face value of the card (Ace = 1, 2 = 2…. J = 11, Q = 12) with
the exception of the Kings. A black King is 13 points (bummer), and a red King is NEGATIVE 2 (this is the
best card, we like these).

While this one says 10:

Face cards: 10 points
Ace: 1
Red King: -1
Joker: 0

As does this set:

Red King: Gives you -1 points, meaning, the lowest possible score is -2 if you have both red kings and no other cards.
All card’s worths correspond with their value: J, Q, black Kings and 10s are worth 10 points, 5 is worth five points and so on, Aces are worth 1 point.

While the Android App rules are ambiguous (and I haven't installed it to see which way the app actually scores it):

Every card is worth its number except the K of hearts and the K of diamonds, which are worth -1