Here you go. It should get you up to speed with the scripting language.
https://documents.blackmagicdesign.com/UserManuals/Fusion8_Scripting_Guide.pdf
Cross reference that with the Lua docs and maybe an AI assistant to make some code and you should be able to do what you're looking for.
Also go to http://www.steakunderwater.com and check out some of the documentation on scripting there.
There's nothing helpful like the scripting assist in After Effects but you should be able to figure things out with the scripting guide.