The convert_encoding filter converts a string from one encoding to another. The first argument is the expected output charset and the second one is the input charset:
{{ data|convert_encoding('UTF-8', 'iso-2022-jp') }}
Note
This filter relies on the iconv or mbstring extension, so one of them must be installed. In case both are installed, mbstring is used by default.
to: The output charsetfrom: The input charset
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https://twig.sensiolabs.org/doc/2.x/filters/convert_encoding.html