There are a few security-style ICOs/tokens that claim to track an basket of coins, presumably by holding those coins in the underlying asset and being redeemable.
I know of Crypto20, but I am not looking for an investment fund, but something like an index and possibly other indexes by sector. Nowadays - Insurance, Payment tools, chain tech, ai, logistics....
Can you elaborate a little? Are you looking for traditional investment (i.e., mainstream stock market) or cryptocurrency investment? Is your point you want sector-focused ICO indexes? It is an interesting idea, if so.