Sorry, don’t think you can.
But you’ll really will help yourself by getting Inkscape (free) and learning how to create the basic shapes there (as svg files)–as it gets you on the learning curve for more complicated designs.
And once you’re used to loading from your own directory, it can be faster to load the shape from your file than open the Shapes, select circle, then change the size to what you want…
And you can Import any image for etching and combine with the shape and save the file, and then load into the GFUI–really does save a lot of time and also means you can save & reload & reprint that image as often as you want when it’s your own file.
And I often Ignore a shape I won’t be using for a while and then activate it again when needed instead of deleting and loading again later…
And much easier to set up multiple copies or versions in an Inkscape file to load to the GFUI than multiple copy & paste or different file uploads (which I first did before I realized there was a better way). At times I’ve done many of the same cut shape and optimize packing in my Inkscape file and with images i think I’ll use more than once, import and save a file for them, as well as a file of just the shapes…
Using the GF shapes can seem faster at times, but you can’t really save those images for later use, so if doing the same shape routinely, having a saved file you can edit and control is best.