I've done a few of these types of cars so far, and am working on one now.
The best method here is to treat the stencil and the outline as separate SVGs. When making these SVGs, you want to make sure the dimensions of the SVG are identical, and the art is in the same place in the SVG.
So for me, I'd make the art in a canvas/frame/artboard… whatever your program refers to this as. Then create my art on one. Then duplicate the frame, and modify each so I have a Stencil one, and an Outline one. Then export the SVG by the frame/canvas,
not the art itself.
Then in the GT7 editor, you drop in your stencil as you normally would. Then duplicate it in the editor and replace it with the Outline version. This will ensure they lay exactly on top of one another.
As mentioned, I'm working on one of these now:
The left complete icon is the end result. The light blue is sort of a green screen here, and isn't part of the exported SVG. Then I broke it up into three separate SVGs. The main circle, the text, and the icon. I realized I needed the main circle to be a stencil sometimes, so that's an alt on top.
I place the large circle in place to position everything. Then duplicate it twice, and swap it out for 2 & 3 to have the entire logo.
Happy to help with any specific questions.