HTTP request, Post Parameter = integer-array

Package: UIPath.WebAPI.Activities 1.9.1-preview
Activity: HTTP Request

Hello,
I use the above activity to send a record to a web page.
for a certain command the website wants to have a parameter but as an integer-array. Since I can only send strings I don’t know how to build it so that the website recognizes it correctly.

As an example I only have this json code:(it is about the parameter label_ids)
image

in the instructions it says that an array of integer must be entered. I have already tested all possible combinations with (, [ and { but without success.

Do you have any idea how this could work

Thank you for your help

David

for my use case i need only one input. so a string with only one element.