Man pages matching name image::metadata::jpeg::structures in section 3pm:

Image::MetaData::JPEG::Structures.3pm.en	debian 10 / libimage-metadata-jpeg-perl
Image::MetaData::JPEG::Structures.3pm.en	debian 11 / libimage-metadata-jpeg-perl
Image::MetaData::JPEG::Structures.3pm.en	debian 12 / libimage-metadata-jpeg-perl