Using some variant over the theme debug output, is usually very useful. In your case I simply removed the chart text to render the entire output as a code block. This resulted in the following output:
And here one can see that issue is simply that you’ve made an array of arrays with just one element. You shouldn’t use [${ data.Date }], but just ${ data.Date }.
Doing this, and changing the code block fence to using tildes instead of backticks, which makes it a whole lot easier to handle in javascript, your query now looks like:
```dataviewjs
const data = await dv.io.csv("Sleep.csv")
dv.paragraph(`~~~chart
type: bar
labels: ${data.Date}
series:
- title: Hours
data: ${data.Hours}
~~~`)
```
Another version accomplishing almost the same chart, but which I think opens up even more possibilities is this version doing most of the work within dataviewjs.