If you use the jisho-app ”Japanese” on iphone you can paste text into the ”Text” field and get it Furiganized.
大仏殿 seems to be called Daibutsuden. But it could be wrong, even Japanese people cannot be sure
Not really a travelling question; Will there be problem from temporarily change steam purchasing country? I came from a country with weaker currency from Japan and would like to gift a steam game to a Japanese friend during my short trip in Japan. I was unable to gift from my home country. What should I put for billing address?