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It depends on the product integration. If you want to provide feedback for the Power BI product integrations (Power BI Desktop and Power BI Dataflows) then https://ideas.powerbi.com/ would be the place to publish those ideas.
For the Power Platform Dataflows, you can publish them in https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas
For Excel you can follow the path that @Anonymous mentioned.
There are other sites, but let me know if the ones mentioned for you work for you.