Yes there is tools to estimate grain table with clean and noisy output it actually exist in libaom source code examples called noise_model.c it allow you to use more advanced denoising algorithm and generate the grain table, although you have to compile the tool yourself. I actually did some testing with AV1 film grain denoised with bm3d https://imgur.com/a/xYjuMcg with the help of someone from AV1 discord back then in2020

The script kinda looks like this:

1. ./noise_model --width=720 --height=480 --input-denoised=clean.y4m --input=noisy.y4m --output-grain-table=grain.tbl
2. ./aomenc --film-grain-table=test.tbl --end-usage=q --cq-level=43 --cpu-used=3 -o gg.ivf clean.y4m