There are a number of options for working with images on ChromeOS. Some of those are actually Android apps installed from the Google Play Store. However, a recent entry may actually prove to be the best option for the most important reason of all – its automatic.
The site is: https://www.remove.bg/
The site isn’t a PWA, but you can still run it as an app on ChromeOS by using this tip: Turn Any Website into a PWA on ChromeOS
Using the tool is easy. You simply upload the image to the site and presto-changeo, the background of the image is removed automatically. You can then save the prepared image (without the background) locally as a PNG file. Note that this only works on images that have people in them.
This is a great tool to add to our growing list of graphics app favorites for ChromeOS.