Is it possible to get code completion for R in Emacs ESS similar to what is available in Rstudio?

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Rstudio has a great code completion feature. It provides a quick view of functions that start with a given string, as well as function and parameter definitions.

ESS is powerful enough, familiar to me, and integrated into Emacs, where I conduct most of my work - so I am hesitant to move, but this feature is making me consider such a move.

Is it possible to integrate this feature into Emacs ESS?

Is there anything similar to this for Emacs ESS?

Any hope that there will be (and if so, how could I support such an effort?)

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