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Welcome to TeX.SX! Please help us help you and add a minimal working example (MWE) that illustrates your problem. Reproducing the problem and finding out what the issue is will be much easier when we see compilable code, starting with \documentclass{...} and ending with \end{document}. At the current state, it is not clear what you are asking for. What do you mean by embedded format?
I was citing tex.stackexchange.com/questions/351241/… " There exist two major ways of defining a bibliography: 1) Embedded Declare \begin{thebibliography} at the end of your file and use \bibitem ... 2) Using BibTeX-.... @article{..." Is it also possible to convert from 1) (embedded) to 2) (bibtex) ?
\documentclass{...}and ending with\end{document}. At the current state, it is not clear what you are asking for. What do you mean by embedded format?