The homepage “About Section” is only designed as a quick way to show the excerpt of another page on the homepage.
It uses WordPress in-built excerpt function which strips out HTML markup such as line breaks, so this is not possible, sorry.
I would recommend adding your text/content to the page content of the homepage in the page editor, and possibly using something like the “Media & Text” block to add your content, with the addition of line-breaks, text formatting, and text to the exact length etc.