pass an offset value to \marginnote{} with tufte::margin_note()

[ericpgreen]

I'm writing a tufte bookdown chapter and have a few instances where margin content overlaps (especially with full width tables). The latex tufte manual suggests that I can set an offset parameter:

\marginnote[offset]{Margin note text.}

Is there a way to pass an offset value to the \marginnote{} environment that R creates? My set up looks like this:

```{r example, results='asis'}
cat(tufte::margin_note("Margin note text."))
```

(FYI I'm using the margin_note command directly because I have to setup conditional evaluation in chunks to handle html vs latex content.)