Here is a simple scrivener project:
SimpleCitations.scriv.zip (208.2 KB)
It uses Scrivener styles for writing (no markdown is in the editor, this will be created by the compiler). There are 4 compiler formats: DOCX | EPUB | TypstPDF | TeXPDF
You need to install pandoc at a bare minimum. I recommend https://brew.sh homebrew for this. brew can also install typst (a 10MB engine that can create PDFs) and I assume you already have TeX installed. There is a test.bib and apa.csl file that needs to be in the folder you compile to: one trick is to use a folder name that has -mmd at the end of the name so Scrivener will leave any files in the folder alone.
This contains the markdown and the sample outputs, just to give you a sense of how the Scrivener text ends up after the compiler does its thing:
Archive.zip (303.6 KB)