'Cairo PDF not converting unicode while creating

I am converting SVG to PDF using Cairo PDF library of Python. It is working well for ASCII characters, but for Unicode chars it is displaying a square box. Is there any solution to deal with this problem?

cairosvg.svg2pdf(
    url='svg_file_with_unicode_character.svg',
    write_to='output.expecting_unicode_character.pdf',
    output_height=720,
    output_width=1200
    )   


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