I thought I had sent the sections but it seems I might not have. The sections GNOME Software uses named using a scheme that would work for snap sections are listed below. It is a subset of the XDG categories (some are grouped together into these categories). If you wanted to use XDG categories that would also work, but it would be more work to fill out.
featured
featured.banner
audio-video
audio-video.featured
audio-video.creation-editing
audio-video.music-players
developer-tools
developer-tools.featured
developer-tools.debuggers
developer-tools.ide
education-science
education-science.featured
education-science.artificial-intelligence
education-science.astronomy
education-science.chemistry
education-science.languages
education-science.math
education-science.robotics
games
games.featured
games.action
games.adventure
games.arcade
games.blocks
games.board
games.card
games.emulator
games.kids
games.logic
games.role-playing
games.sports
games.strategy
graphics
graphics.featured
graphics.3d
graphics.photography
graphics.scanning
graphics.vector
graphics.viewers
productivity
productivity.featured
productivity.calendar
productivity.database
productivity.finance
productivity.word-processor
addons.fonts
addons.codecs
addons.input-sources
addons.language-packs
addons.shell-extensions
addons.localization
addons.drivers
communication
communication.featured
communication.chat
communication.news
communication.web-browsers
utility
utility.featured
utility.text-editors
reference
reference.featured
reference.art
reference.biography
reference.comics
reference.fiction
reference.health
reference.history
reference.lifestyle
reference.politics
reference.sports