How to show code output in text?

Have you read the Wix API Reference for Repeater?
https://www.wix.com/corvid/reference/$w.Repeater.html

How do I populate a repeater with new data?
The most common way to populate a repeater is as follows:

  1. Set the repeater’s data using the data property. This triggers the second step for all items in the data array with a new ID.

  2. Populate the repeater with data from the new items using the onItemReady() function.

If you just want to call data from a dataset, then just use getCurrentItem from Wix Dataset.
https://www.wix.com/corvid/reference/wix-dataset.Dataset.html#getCurrentItem