List of all allowed blocks in config.toml and custom blocks

Is there a list of all the blocks allowed in config.toml such as [params] or [permalinks]? Can we use custom blocks?

This may be helpful:

As for custom “blocks”, you can put anything you want under [params].

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What do you want to add?

This is a secondary and less important part of my question. I am primarily looking for a comprehensive list of blocks that can be used in the config.toml