Hello, I was wondering if I can use excel to insert a new element into my XML file.. lets say I have the following

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And lets say I want to insert a new element <weight> to the map.. is this possible? When I make a new column and name it weight, then put in some information and try to save it, it doesn't save or map

Sorry I am very new to this, it looks like it should be possible but I have spent a few hours looking and can't find an answer to this