Hi M., and all,
From:

Here is a proposal using `repeat`, as:
@startuml
start
:action;
:action;
repeat
repeat
repeat
:(R);
note left: I want the (R) to come in here
:action;
repeat while (OK?) is (No) not (Yes)
:action;
:action;
repeat while (OK?) is (No) not (Yes)
:action;
:action;
repeat while (OK?) is (No) not (Yes)
:action;
stop
@enduml

If that can help,
Enjoy,
Regards,
Th.