Strings can be compared as they are, as long as you number them all with the same number of digits.
Target001, Target002, …
Else, Target2 will sort after Target11.
Anyway, no, there is no generic node to sort an array. Probably because there exists no generic “function as argument” data type in Blueprints, which means that you can’t pass a “comparator” into the function, and Blueprint does not have generics in the sense that it would compare “anything.”
It would be very easy to write as a C++ blueprint plugin / function library, though. Like, really easy, if you know any C++ at all and have Visual Studio installed.