Autocomplete text cell like in Excel

Found only one comment about this feature from a couple years ago, and I can't believe it's not been implemented or not in demand. I know autocomplete works for a dropdown, but I'm using Smartsheet as a sort of workorder management system, and the client has way too many customers and adds customers too frequently to keep updating a dropdown, so it would be nice if when entering data into a cell, if a prior cell had similar contents it could be autocompleted. Excel has had this feature for at least a decade, and it frustrates the user that there is no autocomplete functionality built-in to entering data in text cells.