Thank you for reaching out to Atlassian Community!
I’ve searched about Hiptest and next-gen projects and the only thing that I found is a Trello board from CucumberStudio where they post what they are working on.
As per I could understand, they currently don’t support next-gen and they are working on it.
Also, on their add-on, there is no information about next-gen:
I’d suggest voting for their feature and contact their support directly if you need to know if there is an SLA for this feature to be implemented.