How to boxplot cell array with different length in a single figure

%%This is what i found. But for my approach I am not able to group the data

ZellA= cell(1,2);
ZellA{1,1} = [1; 2; 3; 4 ];
ZellA{1,2} =  [1; 2; 3];

    if true
      % code
    end
  G = [cell2mat(ZellA(1,1)); cell2mat(ZellA(1,2))]; % Grouping data
  B = [ones(1,length(cell2mat(ZellA(1,1)))), ones(1,length(cell2mat(ZellA(1,2))))+1]
  B = B(:)
  figure;
  boxplot(G,B);

   %%My apporach 

figure;
hold on; 
for i = 1 : length(ZellA) 
 boxplot(cell2mat(ZellA(i)),i);
end

[Philipp Fischer]

I solved the problem with the tab2box() function of: https://www.mathworks.com/matlabcentral/fileexchange/46545-alternative-box-plot