nvim-treesitter/runtime/queries/kdl/highlights.scm

; Types
; Variables
(identifier) @variable

; Nodes
(node
  (identifier) @tag)

; Type annotation
(type
  (identifier) @type)

; Properties
(prop
  (identifier) @property)

; Operators
[
  "="
  "+"
  "-"
] @operator

; Literals
(string) @string

(escape) @string.escape

(number) @number

(number
  (decimal) @number.float)

(number
  (exponent) @number.float)

(boolean) @boolean

"null" @constant.builtin

; Punctuation
[
  "{"
  "}"
] @punctuation.bracket

[
  "("
  ")"
] @punctuation.bracket

";" @punctuation.delimiter

; Comments
[
  (single_line_comment)
  (multi_line_comment)
] @comment @spell

(node
  (node_comment)
  (#set! priority 105)) @comment

(node
  (node_field
    (node_field_comment)
    (#set! priority 105)) @comment)

(node_children
  (node_children_comment)
  (#set! priority 105)) @comment