So, the answer is no here, Unlike the i-Level capsule, the Joie 360 Spin is not a car seat that can go on (any) stroller - this is only for the car. It doesn't even feature a carry handle because of that.
So I would most certainly keep your i-Level for now, and when your little one is around 10-14 months old, you'll smoothly pass on to the 360 Spin and won't use your stroller as a travel system anymore... this is only natural.
Hope I helped clearing this up! I would most appreciate you guys helping other parents by leaving a short review of the stroller you own, the Joie Chrome DLX, here, please. You'll help many other parents with their choice thanks to your experience.
Thank you so much, and stay safe!