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In https://groups.google.com/d/msg/public-dns-discuss/1AenCyssu9s/HIXGH-NuDAAJ
Chauncy writes:

Trying to get TXT record of domain 0.80216562.112802646.tree.comodo-sabre.ct.googleapis.com, got:

{"Status": 0,"TC": false,"RD": true,"RA": true,"AD": false,"CD": false,"Question":[ {"name": "0.80216562.112802646.tree.comodo-sabre.ct.googleapis.com.","type": 16}],"Answer":[ {"name": "0.80216562.112802646.tree.comodo-sabre.ct.googleapis.com.","type": 16,"TTL": 21594,"data": "\"����SU �   �^ �� �5������\\�2!kDG���G�~ź�%h������      I�Br��� }���h�\\��}:w`�7ڨ
4b}�+�� ����_����Tf���I*�x�B�� )q��i�A���Y��xSˤGf�\\�OM,��'�7X�  ݃�� ΨL�0 �~=����e �sDʽ n��3��e�]���� W�,�c � �DG��A   fi�r P�jO�Q �t��4Ƈ\""}]}

Query URL: https://dns.google.com/resolve?name=0.80216562.112802646.tree.comodo-sabre.ct.googleapis.com.&type=16

I'm not sure whether any particular binary data causes the parse error, or merely the presence of any non-ASCII.

By principle of least surprise, this should get \-encoded per DNS zonefile (RFC 4343) rules (three-character *decimal* numbers) so that the text matches the `dig` result, and the resulting backslashes should then be doubled for JSON encoding:

    {"Status": 0,"TC": false,"RD": true,"RA": true,"AD": false,"CD": false,"Question":[ {"name": "0.80216562.112802646.tree.comodo-sabre.ct.googleapis.com.","type": 16}],"Answer":[ {"name": "0.80216562.112802646.tree.comodo-sabre.ct.googleapis.com.","type": 16,"TTL": 21594,"data": "\"\\129\\156\\152\\238\\143SU\\011\\149\\028\\008\\007\\242^\\002\\164\\209\\027\\1485\\132\\192\\185\\172\\130\\217\\\\\\2422!kDG\\133\\235\\251G\\193~\\197\\186\\133%h\\129\\153\\188\\211\\246\\203\\009I\\129Br\\136\\177\\198 }\\231\\182\\215\\230h\\246\\\\\\254\\224\\168}:w`\\2207\\218\\168\\0104b}\\215+\\251\\183\\008\\162\\160\\223\\198_\\133\\163\\208\\242Tf\\246\\133\\209I*\\155x\\148B\\241\\233\\030)q\\255\\171i\\177A\\132\\168\\192Y\\160\\191xS\\203\\164Gf\\253\\\\\\240OM,\\176\\132'\\1347X\\140\\006\\003\\221\\131\\150\\200\\016\\206\\168L\\2340 \\145~=\\133\\184\\244\\239e\\027\\238\\186\\169\\253sD\\202\\189\\005n\\190\\1503\\250\\164e\\197]\\183\\177\\205\\228\\131\\005W\\246,\\178c\\015\\188\\030\\233DG\\172\\193A\\018\\016\\127fi\\210r\\029P\\216jO\\225Q\\003\\164t\\146\\2384\\198\\135\""}]}

FWIW, the Cloudflare JSON format response is a NODATA (empty answer) although their binary UDP/TCP/TLS responses have the correct data.