Allow setting print order

[imbeyondboredom]

Is your feature request related to a problem? Please describe.
When I'm printing anything using the palette using chroma, I always include a single 20mm * 20mm * 1stlayerheight square that I have print first to purge any colors leftover in the nozzle from another print. This is great because I don't have to put a skirt on every possible object I'm printing. I hate doing that because it creates unnecessary lines that use up filament but also increases the size of all of the objects I'm printing so I can't fit as much on the bed. I'm trying to switch from my personal slicer to Canvas as I recently brought a Palette3 Pro and canvas does not support setting a print order so I can't get this behavior anymore.

Describe the solution you'd like
I would love a way to control what objects print first so I can set up this block to print first and get any of the odd color change still stuck in the nozzle out before printing my actual print.

Describe alternatives you've considered
I would also be completely ok with a custom object similar to the purge tower that one could place on the bed and it would act the same as the thing I'm currently doing manually: a small square at the same height as my first layer that prints first

Additional context
Add any other context or screenshots about the feature request here.