You can do it programmatically through add_block and set_param, as per my understanding. Please refer the following example.
sys = 'Sample'; % model is Sample.slx
open_system(sys) % Open the model
for i=1:5
h = add_block('simulink/Signal Routing/From',[sys '/From'],'MakeNameUnique','on');
set_param(h,'Gototag',strcat('goto',num2str(i)));
end
Similarly you can create multiple GoTo blocks as well. The 'Position' parameter can be used for mentioning the position in model for each block in model window.
Yes, a goto label can have the name of the signal, coming out of the Bus Selector.