rok commented on code in PR #41257:
URL: https://github.com/apache/arrow/pull/41257#discussion_r1585212898


##########
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 is supported.

Review Comment:
   Does this make sense @emkornfield ?
   ```suggestion
     Non-standard encodings using Binary types are not supported.
   ```
   
   > In the short term we should probably recommend that implementations should 
likely reject Binary annotated JSON fields
   
   By this you mean serializing binary data into UTF-8 string and including it 
as a String? So you see a downside to allowing that?



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