Thanks for the response @mebeingken.
I did try something like that but will keep at it.
The schema in wappler is picking it up correctly (by using the copy/paste method) as you can see here:
But in the Wappler repeat UI it doesn’t seem to recognise the full hierarchy in that I can put a repeat on Rows, and output f. I can then put a repeat on f but then CAN’T output v.
Even though i can’t output v. If i add a simple setValue inside the f repeat, i do see the v value as an option to select.
I thought that would work… but the end result when i run the API is empty 
I’ll continue to experiment.,