How to type json files as tsconfig.json and package.json

I noticed that some json files with specific names get intellisense, like:

1. tsconfig.json
2. jsconfig.json
3. package.json
4. .eslintrc.json
5. .prettierrc.json

Some screenchots

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how can i type the schema of my own json files is it declares as a json module or something similar?

I already found that the json Schemas are based on the json-schema.org that would enable intellisense for json files

here is a good intro for defining your own json schema https://json-schema.org/understanding-json-schema/basics.html

here is a screenshot