Hello Ncnteam,
You will need to find the peak manually. This can be as easy as finding the maximum value in the array. A quick search shows a simple vi is provided for this type of functionality.
https://zone.ni.com/reference/en-XX/help/371361G-01/glang/array_max_and_min/
And it looks to be available in the base version of Labview.
Let us know if you have additional questions or if this didn’t answer your question.
Regards,
Andrew