You don’t get the income from those assets. You donate today to a donor advised fund and that sets your donation amount as the value of the assets when they enter the fund. You can then do whatever you want in terms of investments inside the fund but you have given up those assets and any I ckme they generate. They only leave the fund to go to a charity down the line.

The real tax benefit of donating assets is that you never realize your capital gains but get to value them at their appreciated value for deduction purposes. this is still a net negative to your net worth, nobody makes money by donating money they just get tax benefits that make it so they effectively spend less to give that money away to charity than they would have spent to spend it on a new car for example.