All tasks employee /
Generalist (note: it does necessary mean "HR Generalist" but any employee who does all kinds of work) /
the complete employee/
the perfect employee/
jack-of-all-trades employee
Mr. Fixit employee
All around-employee

It is a new trend in Arabic business world to have an employee of all works/all tasks that should be achieved in one place rather than in different departments.
My suggestion goes first to : all in one employee or all tasks employee or generalist . I meant by generalist as opposed to specialist.

a person whose knowledge, aptitudes, and skills are applied to a field as a whole or to a variety of different fields (opposed to specialist).
https://www.dictionary.com/browse/generalist

Bill Gates recommends generalists over specialists
"There's a reason why Bill Gates recommended Range: Why Generalists Triumph in a Specialized World by David Epstein as one of his top reads of the season in December 2020?
https://www.techtarget.com/whatis/feature/Generalist-vs-spec...

Here are a few examples of generalist careers:
sales
project management
human resources
business operations
https://www.techtarget.com/whatis/feature/Generalist-vs-spec...

What is a generalist?
Generalists boast a range of skills. While their knowledge might not run deep across a specific area, they can quickly adapt to changing situations. For example, a writer can be classified as a generalist if they can write in multiple styles and genres or if they have experience writing for multiple industries.
https://www.techtarget.com/whatis/feature/Generalist-vs-spec...

Generalists obtain a variety of skills that can be useful in different fields. For example, generalists working in social media typically learn about search engine optimization (SEO), copywriting, and website management. They can apply these skills when managing the social media accounts of organizations in, for example, the technology and healthcare industries.
https://ca.indeed.com/career-advice/finding-a-job/generalist...

For formally communicating a person's role in the company, I would consider referring to him or her as a generalist. Contrast this to a specialist, whose job is defined very narrowly.
https://english.stackexchange.com/questions/163213/what-is-t...

More suggestion in the following article:
https://blog.ongig.com/job-titles/job-title-for-someone-who-...