You have to use the row trigger, just put in a condition to check the column every time a row is modified/created and send Teams based on that. You always have to know the row number to do something in excel so they trigger on row.
Well apparently my brain failed me I thought I had seen a trigger for updating a row trigger. There is only the new excel integration option which is a manual flow for a row of data. Otherwise looks like file modification which does no good when it comes to excel.
Might be best to look at moving that excel data into a SharePoint list, then you'll be able to easily pinpoint that trigger and open up a much broader toolset.