\startchapter [title={Mill}] [image=cow]
\dorecurse{21}{\samplefile{lorem}}
\stopchapter
\startchapter [title={Mill}] [image=hacker]
\dorecurse{32}{\samplefile{lorem}}
\stopchapter
\startchapter [title={Mill}] [image=mill]
\dorecurse{21}{\samplefile{lorem}}
\stopchapter
\stoptext