How do I assign a different category list to each row in the same column using UITable in AppDesigner?

Hello,

One of the issues I am facing is that I'm trying to sort a list of categories depending on each row in a UITable. It seems that once I convert the column to categorical, Matlab does not permit me to change the categories of any of the rows individually. Can anyone point out my error or point me towards a workaround? Here is the problem.

% This line sets the categories for the whole column
app.UITable.Data.Var2 = categorical(app.UITable.Data.Var2, {'None',vals{:}});

% This line does not permit me to change the categories to a new order specified by index array j
app.UITable.Data.Var2(1) = categorical(app.UITable.Data.Var2(1), {'None',vals{j}});