You might have abandoned Google slides in favour of Canva because of the ease Canva allows you to add and edit images but Google slides have a couple of new additions to their image feature which will make life easier. It now has an Ai image generator and a remove background function.
Go to insert image as normal, then click on 'Help me create an image.' Once you have selected your image the 'remove background' function pops up.
If you have to record your slides they now also have a built in record function so no more looming!