Check out example codes for "SQL Developer store procedure insert json file to blob". It will help you in understanding the concepts better.

Code Example 1

CopyINSERT INTO my_table (json_doc)
  VALUES (UTL_RAW.convert(UTL_RAW.cast_to_raw('{....}'),
                          'AL32UTF8',
                          'WE8MSWIN1252'));

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