Double wye question

I'm considering a bathroom addition on a second floor and have been looking online for DWV schemas. The closest to what I'm considering is the WC connected to the main waste stack via a low-heel vent 90, then to a 3 x 2 wye. A sink connects to the 2" side of the wye. I'm wondering if I can use a double wye, 3 x 3 x 2 x 2, and run the bathtub drain off the other side? Other schemas I've seen used two separate wyes, one under the other, to connect the sink and bathtub. Thanks in advance.

I'm trying to picture what you have, here are some examples

If the toilet is connected to the "top" of any fitting, and the sink, tub, or shower does NOT have its own vent, you cannot do it.