Added braces using LSFT(KC_LBRC) and LSFT(KC_RBRC) since the normal RBCR and LBCR didn't work for me.

keyboards/atreus/keymaps/xyverz/keymap.c

@@ -53,7 +53,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     {KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_NO,   KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN},
     {KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_NO,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10 },
     {KC_TRNS, KC_TRNS, DVORAK,  QWERTY,  COLEMAK, KC_LCTL, KC_TRNS, KC_TRNS, KC_TRNS, KC_F11,  KC_F12 },
-    {KC_TRNS, KC_TRNS, KC_LGUI, KC_TRNS, KC_BSPC, KC_LALT, KC_SPC,  KC_TRNS, KC_TRNS, KC_TRNS, RESET  }
+    {KC_TRNS, KC_TRNS, KC_LGUI, KC_TRNS, KC_BSPC, KC_LALT, KC_SPC,  KC_TRNS, LSFT(KC_LBRC), LSFT(KC_RBRC), RESET  }
   }
 };