Font size at bottom of cover page

When I want to put the author or illustrator’s name on the front cover of a Big Book to give them the credit they deserve, I like to have the size of font at least in the 26 pt range. But this also increases the language name (English) and the topic name (Animal stories) to the same size which is overpowering. Can we please be able to determine the sizes of font in text boxes below the picture separate to each other? When using the book we encourage the reading of the author/illustrator’s name but the rest of the info there is for the archivist, not the children in class so doesn’t need to be large print.