Htmlifier https://sheeptester.github.io/htmlifier/ Htmlifier is a tool for turning your scratch file into html so you can submit your project on itch.io jam site.
Turbowarp https://extensions.turbowarp.org/ Turbo warp is a third party website that lets you make scratch projects with a couple small additions like a right click detector and lets you compile it into JavaScript and HTML. Turbowarp also lets you bypass many Scratch requirements like the small screen size, some arbitrary limits, and compiles into JavaScript while editing for faster running games.
If you need help with the jam site itch.io, you can check out our guides for jams:
MAKING AN ITCH.IO ACCOUNT AND JOINING A GAME JAM https://docs.google.com/document/d/1VLvVqafAhBlQw9-pAQtu1wWyJ90H95ACjBbVVPDMeVM/edit?usp=sharing
CREATING AND SUBMITTING A JAM PROJECT ON ITCH.IO https://docs.google.com/document/d/19L39WJHUswKnlN8T__dpEUfjcwaixN6bMqVgS8ABK9k/edit?usp=sharing
Note that on our Discord server https://discord.gg/FADSj49eSB you can look for jam team members in find-gamejam-team or see a list of tools in -jam-tool-box . You don't need a team, but you are welcome to form one if you enjoy it.