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Update graph with multiple traces using updatemenus

I am updating a scatter plot using updatemenus that take as arguments the fields I want to update:

dict(label = category,
      method = 'update',
      args = [dict(x=[df[(df['cat_name'] == category) & (df['cat_level'] == cat_level)]['value']], 
                        y=[df[(df['cat_name'] == category) & (df['cat_level'] == cat_level)]['count']],
                        meta = [["Category:" + category]]

I have a second trace that I’m adding (it’s a best fit line), that I would like to have update as the menu choice change (when the user selects a menu category the visual updates with that category data - therefore the line of best fit should change).

Is there a smart way to construct this?