Pie Chart Progress
For the radial progress bar type you are able to set a custom background color for the text with the percent of completion. Progress color pickers supports RGBa, this means they have controls to change the alpha channel of the color, so if you configure this with an alpha of 0 they will look like a pie chart:
SVG for images
Probably you are looking to add SVG icons instead of images. Your first problem will be that WordPress do not allow SVG uploads for security reasons.
Well, you just need a plugin to enable SVG uploads like SVG Support and you will be able to choose SVGs as images for your progress.