I attended a talk where the presenter used quarto rather than RMarkdown to create their slides. I had never heard about quarto, so I did some searching. There are a lot of web pages talking about Quarto, and this one by Yihui Xie is a good one to read if you already know and love RMarkdown.
Yihui Xie. With Quarto Coming, is R Markdown Going Away? No. Yihui’s Blog, 2022-04-29. Available in html format.