A thing I find mildly frustrating is that if you have a tab that is crunching CPU use to 99% the Chrome task manager can tell you which one but if you have a tab that is driving GPU use to 99% the Chrome task manager doesn't know about that
Maybe only the OS knows that. IDK
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Chrome uses a single sandboxed GPU process with the site sandboxes sending the rendering commands to it via IPC so it only actually has a single process using the GPU.
At least with an NVIDIA GPU, you can monitor process usage, but it will all be the Chrome GPU process.
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I don't really think Chrome provides much in the way of useful monitoring for what's using the GPU. It's entirely Chrome's responsibility to provide it due to how it proxies GPU usage through GPU process to sanitize data and avoid giving direct driver access to site sandboxes.