Oh, I've been down this exact rabbit hole. 👀
Tampermonkey is a solid shout - it's been around forever and lets you inject custom scripts to hide specific page elements. I've used it to strip out the "Recommended for you" junk in other platforms, so it should work for Google Ads clutter too. Just needs a bit of fiddling with the CSS selectors.
Another approach (if you're not wedded to Chrome) is uBlock Origin's "Block Element" feature - you can right-click and hide any element on the page. 🚫 Works beautifully on Firefox, but yeah, Chrome killed Manifest V2 support, so it's basically dead on Chrome now. And Google Ads on Firefox can be a bit janky - I've seen weird rendering and slow loads.
Would love to know if Tampermonkey does the trick for you - I might give it a proper go myself.