How to cancel Auto-renewable subscription bought in Testflight?

I've read several topics on cancelling subscriptions in sandbox environment, but it seems to me that it could not be applied to TestFlight.

I can cancel sandbox subscriptions through Settings > App Store > Sandbox account.

But since TestFlight does not use sandbox account I cannot cancel a sub from there. Also, TF purchase does not appear in the list of regular subscriptions (Settings > Profile > Media & Purchases).

So my question is: is there any way to manually cancel auto-renewable subscription bought in TestFlight build of the app?

It looks like this API displays application's subscriptions, and the test ones should appear there as well

  func showManageSubscriptions(){
        if #available(iOS 15.0, *) {
            if let window = UIApplication.shared.connectedScenes.first {
                Task {
                    do {
                        try await AppStore.showManageSubscriptions(in: window as! UIWindowScene)
                    } catch {
                        print(error)
                    }
                }
            }
        } else {
            // Fallback on earlier versions
        }
    }