Since it is often controversial what the phonemes of a language are, and since languages are generally not monolithic, this is not a common sort of standard reference item. It's also complicated by the fact that it's not completely obvious what a grapheme is. For example the letters ب ت ث are three different letters, likewise س ش and غ ع but are arguably not as many separate graphemes (they decompose into a base plus 1-3 dots). And while English s, h, t are distinct graphemes and [s t h ʃ θ] are distinct phonemes, you can't say that the grapheme s represent two phonemes ([s,ʃ]) and h represents a half dozen or so ([h,ʃ,θ,f,r,k,tʃ]). You could perhaps say that the letter h is orthographically involved in the representation of a number of phonemes. In other words, the core concepts need to be defined a bit more precisely.