How do I fill big spaces using auto tile?

Hey guys

I just recently started using the auto tiling brush on Construct 3 and I'm curious if there is a way of fast filling big spaces, such as this:

This big pink tiles block needs to be filled with tiles. But by using the auto brush, I have to hover all over the place while holding left click, just as if using the pencil. Is there a way of combining the rectangle fill functionality with the auto brush? Maybe a keyboard shortcut that I'm missing?

I already tried clicking on the auto brush and then clicking on the rectangle, but it doesn't seem to combine their functionalitys this way.

Thanks