Join multi-line text field to one line

Hi all. I'm trying to find a way (either using a formula or in Pipelines) to join a multi-line text field to a single line.

Use case: The multi-line text field will contain text that will go to the JSON request body of an API call in Pipelines, so the field needs to be converted to a single line. The field has to a multi-line text field, because values can contain several paragraphs and app users can easily customize it.

Thanks!