FWIW, Sage Advice ruled that you cannot cast it on yourself.
https://www.sageadvice.eu/can-you-cast-warding-bond-on-yourself/
Resh
2024-04-21 23:39:50 +0000 UTC
I actually looked into this spell recently for a character I am playing. Notably, the damage you take is the same type as the source, meaning the caster can further reduce it with blade ward/absorb elements or other features.