This reminds of Bowie Bonds. In 1997, David Bowie became the first recording artist to sell bonds with the royalties from his previous recordings. https://www.investopedia.com/terms/b/bowie-bond.asp
This was investment of the future earning potential of something that was already proven to be a commercial success and was seen at the time as a "sure thing". The article explains why although it ended well, there was an unexpectedly rocky period in the middle of the 10-year maturity of the bonds. So even a "sure thing" can be risky.
Creating an investment vehicle for someone's future potential is even more risky than life insurance, whether or not such shares or bonds give the investor any control. Even if a majority of investors vote to force someone to take a particular job, there is no guarantee they would succeed at it.
I had a friend who dropped out of medical school in her last year (decades ago), and has spent and will continue to spend the rest of her life paying off the student loans involved. If she had sold shares of her future earnings in exchange for her education costs, she'd be debt-free, but those investors would all have lost their investments. What about other unexpected problems: development of long Covid, a mental illness, or something like Parkinson's Disease or even ALS? You can't have shareholders vote to prevent someone from becoming unable to work, or at least there is no way for it to be effective.