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Dear respected Daniel S._101S,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, for two-ways sync Excel sheet with SharePoint online list, I'm afraid you may use Microsoft Power Automate Flow trigger **** tool that allows you achieve your requirement. For your reference: Power Automate: Sync Excel to a SharePoint list - Manuel T. Gomes (manueltgomes.com) Solved: Two-Way-Sync between SharePoint and Excel - Power Platform Community (microsoft.com)
If you want to learn more about it, to make sure you get professional help, we’d you go to Power Automate Community to post. Which is specific channel to handle related questions. And engineers in that forum will focus on your specific scenario and provide specific suggestions.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad