After installing this add-on on Google Sheets, you now have access to the PINYIN() and JYUTPING() functions.
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You can open an issue on github, or email mandarincantonese@mailc.net to report any problems.
Want to support my work on this add-on, and get priority feature requests, bug fixes ? Become a supporter on patreon: https://www.patreon.com/lucw