I understand that you want to access a vector of TiledLayout axes and to keep put them in order.
If you're using MATLAB R2022b or later, you can use tilenum to get the tile index number for each tile. Then you can sort the vector of handles.
Demo:
Create tiledlayout and plots
tcl = tiledlayout(3,2);
for i = 1:6
nexttile
plot(rand(4))
end
Get axis handles and sort them in order
axh = findobj(tcl,'Type','axes');
axidx = tilenum(axh);
axh = axh(axidx);
Add legends using the problem shown in the question.
legend(axh(1))
title(axh(1)', '1')
legend(axh(2))
title(axh(2)', '2')
