Adding me to my finances credit cards will increase my credit score?

I have zero debt owed on my credit cards and have a 765 credit score. My available credit is 15k over two credit cards.

My fiancé has zero debt owed on her credit cards. Her available credit is 150k over 4 cards.

The question is that if my fiancé adds me to her cards, I now will have access to 150k extra in available credit. While I have no desire for the access itself, as I am very conservative with my spending. My main question is to know if she adds me to her cards and I now have 150k in credit added to my name on paper, will this be reported to credit bureau?

Secondly will my credit score now increase because of my higher credit availability?