Graphics Preview of Custom Graphics Objects (not Standard Qt Quick Controls) in Qt 5

[giaphin]

Dear Experts,
I am using Qt 5.15.2. I am trying to make a vehicle cluster UI using custom graphics objects, (not those standard Qt Quick Controls).

I referred to the example project CoffeeMachine. I can load CoffeeMachine UI in Design Studio, and preview the graphics components.

I wish to ask if I can:
(i) load my vehicle cluster UI with custom graphics objects with Design Studio, as I did for CoffeeMachine?

(ii) run Design Studio with the older Qt 5? Is Design Studio only meant for the latest Qt 6?

Many thanks in advance for clearing my doubt.

Sincerely,
giaphin