Will recursion be supported in wrangle in the next version ?

probably never

If it helps, you can implement recursion in what's called “stack base recursion”. Not as elegant and simple to implement as traditional recursion, but it works.
I followed this to get the idea : https://sergeneren.com/2018/09/23/recursion-in-vex/ [sergeneren.com]

See this thread https://www.sidefx.com/forum/topic/75093/ [www.sidefx.com]

to julien-b: good job! Thank you very much!
to Jonathan de Blok: You have a good sense of humor