Add map properties highlighting

queries/highlights.scm

@@ -49,4 +49,10 @@
     field: (identifier) @variable.member))
 ; }}}
 
+; Expressions {{{
+(map_expression
+  (property
+    field: (identifier) @property))
+; }}}
+
 ; vim: sw=2 foldmethod=marker

test/highlight/properties.bp

@@ -0,0 +1,7 @@
+foo {
+    field: {
+    // <- variable.member
+        key: 42,
+        // <- property
+    },
+}