Absolutely! This is an awesome feature that many books showcase and here's how to do that within Atticus.
From within the chapter you are looking to split, place your cursor at the end of the paragraph that lines up with the final word of your page and click the Split Chapter button:
You'll now see that chapter split into two from within your left-hand navigation pane:
Next, add your full page image and move it in between the two chapters and upload your image. Make sure you choose to Hide in Table of Contents for the image:
After that, find the SPLIT portion of the chapter from within the left nav pane and click the three dots to the right. Uncheck 'Numbered Chapter' to avoid mis-numbering chapters to follow.
Finally, within the SPLIT chapter, click the cog icon and ensure the following settings are checked:
Since this SPLIT portion is technically a new chapter, you'll want to hide the heading to avoid disrupting the content flow!