How to let :hardcopy support conceal?

Hi, list,

I'm using :hardcopy on windows, find that the conceal feature will
disappear when printing, how to configure vim to support it, or is it a
missing feature?

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Regards,
Yue Wu

Key Laboratory of Modern Chinese Medicines
Department of Traditional Chinese Medicine
China Pharmaceutical University(中國藥科大學)
No.24, Tongjia Xiang Street, Nanjing 210009, China

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