How to replace a value with another value?

Hi,

I have read https://webappick.helpscoutdocs.com/article/28-how-to-use-command-to-format-attribute-output but still don’t understand how to replace a value with a hardcoded value.

What I want to do is change all the availability status “on backorder” to “preorder” or maybe “in stock” in the feed. Otherwise Google Merchant Center won’t accept the value.

What string can I use to make this happen in Woo Feed?

Many thanks,
Cristoffer