Excel has had a JavaScript api since at least 2016. Excel online definitely has the ability to integrate with online services, although at that point you really

Excel has had a JavaScript api since at least 2016. Excel online definitely has the ability to integrate with online services, although at that point you really want something like Power Automate. See also Microsoft Graph, which has an Excel API as well. Edit: https://docs.microsoft.com/en-us/graph/api/resources/excel?view=graph-rest-1.0 https://docs.microsoft.com/en-us/graph/api/resources/excel?v...