An iPad is not a proper replacement for a chromebook. The biggest difference is that iPads only have mobile browsers, whereas chromebooks (laptop, desktop, or tablet form-factors) have a desktop version of the Chrome web browser.
Yes, there is an iPadOS version of the Chrome browser for the iPad but it uses the same mobile web engine as iPadOS Safari (an Apple requirement).
The major difference between mobile and desktop browsers is full support for browser extensions. This is not just for web browsing, but extends to the Google apps (Docs, Sheets, Slides). Each of those apps can have extensions added to them to enhance and extend functionality. The iPadOS version of those apps are not able to do that.
My daughter is an elementary school teacher and uses chromebooks in the classroom. She has had a few students who tried to use iPads for their homework assignments and projects, but the limitations of iPadOS were too great for them to use the iPads effectively.