Is there a way to bold row labels for html tables?

`Viewer` has the argument `row.names.bold` which does not seem to be in use right now. I'm wondering if there is an alternative simple way to add the markup?  For example, with `** My Label **`

```r
basic_table() %>%
  split_cols_by("ARM") %>%
  analyze("AGE", show_labels = "visible", var_labels = "** AGE **") %>%
  build_table(ex_adsl)
```