Trying to find some library able to convert / create a PDF/A (https://en.wikipedia.org/wiki/PDF/A)

The already present anwers about it seems to call an external service (NodeJS - Generate PDF/A compliant document) or no response at all (How to create pdf/a-1b file using node js?)

I know that some libs exist on other languages (ghostscriptProcessor), but i cannot find anything on npmjs.com