Is there an easy way to put in a placeholder in the search textbox option?

### Discussed in https://github.com/quarto-dev/quarto-cli/discussions/7599

<div type='discussions-op-text'>

<sup>Originally posted by **frscott** November 15, 2023</sup>
### Description

````qmd
website:
  search:
    location: navbar
    type: textbox
````

I would like to put in a placeholder. Is the only way to do it if I insert some JavaScript in the header?</div>