Is there a way to merge different path to the same Control block?

Question

There are only two targeting block which is s1 and s2,but they come from different divergent path through many condtions,like:

source code :

@startuml
!pragma useVerticalIf on

:do sth1;

if (cond1) then
    if (cond2) then 
        :s1;
    else
        :s2;
    endif
else
    if (cond3) then
        :s2;
    else
        :s1;

endif

@enduml

I have tried use label and goto ,but it didn't works.

How to make the arrow point to the same s1 or s2 rather than a copy of them?