Basket for index

Good morning, I am Luca Cavalli, a consultant at BE. I love services, especially ai basket, but I have been wondering these days, what if there were also a "basket" for the stock market, for example Apple, Nvidia, etc., creating presets for the "blue chips" of the stock market, startups, etc.? Would the calculation system be the same, just applied to a company instead of a crypto asset?