Chromium is already requested for packaging. But its set as low priority
Marking as low priority due to:
There is a workaround if you really want to use it. You can use appimage to run chromium
Download Chromium .appimage file from the following location
Since its appimage, you dont have to install it. Just right click on the downloaded file and go to Properties -> Permissions and check “Allow executing file as a program” checkbox
Once done, you can double click the file to run Chromium. I did not test much. But basic browsing works fine.