I need to provide my soon to be x-wife a guarantee for a claim against my estate

I need to provide my soon to be x-wife a guarantee for a claim against my estate for the balance of her alimony in the case of my death. "6.10 Life Insurance. Due to the age and health of the parties, which interferes with the ability of husband to procure life insurance, in the event of husband's death, any outstanding obligation under this agreement, shall become a charge on husband's estate in the full amount of the then existing obligation with a maximum value of $100,000.00 and recognized as a legal obligation of the husband and a claim upon husband's estate. That existing obligation being the remaining alimony to be paid had the husband lived for the duration of this agreement." HOW DO I DO THIS?