jorisvandenbossche commented on code in PR #41257:
URL: https://github.com/apache/arrow/pull/41257#discussion_r1585269512


##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -251,6 +251,27 @@ Variable shape tensor
    Values inside each **data** tensor element are stored in 
row-major/C-contiguous
    order according to the corresponding **shape**.
 
+.. _json_extension:
+
+JSON
+====
+
+* Extension name: `arrow.json`.
+
+* The storage type of this extension is ``StringArray`` or
+  or ``LargeStringArray`` or ``StringViewArray``.
+  Only UTF-8 encoded JSON as specified in `rfc8259`_ is supported.
+
+* Extension type parameters:
+
+  This type does not have any parameters.
+
+* Description of the serialization:
+
+  Metadata is either an empty string or a JSON string with an empty object.

Review Comment:
   In addition to being an empty string, is it also allowed to be just absent?



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