How do you pass array in QueryString?

I have the following endpoint /user/bySecurityGroup/{stringArray}.
In creating the endpoint {stringArray} is an array of strings.
This works fine when I'm using the XANO tools, but how do I pass an array to the QueryString when the request is coming from outside of XANO e.g. from the Swagger Docs?
I've tried a number of different combinations but no luck.

Thanks,
pete