This datapack allows you to do the following with campfires:

• Break down cobble into gravel
• Unpolish (roughen) stones (works with full blocks, stairs, and slabs)
• Crack bricks
• Cobble stone and deepslate
• ...and unchisel sandstone

Currently, there is no mod support, however this is planned.

Check out the gallery for fancy recipe screenshots, thanks EMI!