It really depends on what WordPress allows to be cached. If it doesn't allow any cache, then it would be 1:1 for pages that load data from WordPress. If however it does allow cache, then the ratio would be much less. You can control the cache on WordPress. I just did a quick search and found a plugin that may be of use, but i have zero experience with it
https://wordpress.org/plugins/wpgraphql-smart-cache/