The Markdown component allows users to format any type of text so it is publishable as plain text without looking like it's been marked up with tags or formatting instructions. The Markdown component provides is a lightweight formatting language which is easy to write and easy to read. Markdown's formatting syntax only addresses issues that can be conveyed in plain text. For any marked up content that is not covered by Markdown's syntax, you can use HTML. You can even change the color of text in the component with HTML tags using the 'source' prop in the Property Editor as shown in Example 2.
To learn more about how to use Markdown component for publishing plain text, refer to the following articles: Markdown Basics and Markdown Node Types.
Manually Adding Line Breaks
If you would like to manually add line breaks, the most direct approach would be to disable the escapeHTML property, and add your own paragraph and line break elements. Once disabled, you can add line breaks as seen below:
Value of "source"
Because there isn't a line break between "four" and "five", they're on the same line.