Android Question Google Sheets - Get Column name by value of cell in particular row

Hi,

Is there a way to find the column name by checking for the value of a cell in a particular row?

ex.
Column "M" in row 3 has the value "A".
How can I find the name of the column (in this case "M") by searching the value of cells (in this case "A") in row 3?
(each cell in Row 3 has unique values)



Hope I'm being clear in my question here....

Regards.