Can't format md frontmatter

[ThomasPellegrini]

Hi,
I am trying to make some changes to the formatting of the text in the md files. For example, I would like to make some text bold or add some line breaks to the product blurbs.

What is the expected behavior?
I tried to split the text by newlines and generate a <p></p> for each sentence to add some line breaks to the product blurbs but it didn't work. I tried also to change the scheme in .yaml file to be a markdown instead of textand to make each newline a new text item in the text collection.
This changes work in the preview of the md file but not on the actual website.
Any suggestions?

Other relevant information:

System:
OS: Linux 5.8 Ubuntu 20.04.2 LTS (Focal Fossa)
CPU: (8) x64 Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz
Shell: 5.8 - /usr/bin/zsh
Binaries:
Node: 10.19.0 - /usr/bin/node
Yarn: 1.22.5 - /usr/local/bin/yarn
npm: 6.14.8 - /usr/local/bin/npm
Browsers:
Chrome: 89.0.4389.90
Firefox: 86.0
npmPackages:
gatsby: ^2.20.35 => 2.32.4
gatsby-image: ^2.3.5 => 2.11.0
gatsby-plugin-netlify: ^2.2.4 => 2.11.0
gatsby-plugin-netlify-cms: ^4.2.5 => 4.10.0
gatsby-plugin-purgecss: ^5.0.0 => 5.0.0
gatsby-plugin-react-helmet: ^3.2.5 => 3.10.0
gatsby-plugin-sass: ^2.2.4 => 2.8.0
gatsby-plugin-sharp: ^2.5.7 => 2.14.1
gatsby-remark-copy-linked-files: ^2.2.4 => 2.10.0
gatsby-remark-images: ^3.2.6 => 3.11.0
gatsby-remark-relative-images: ^0.3.0 => 0.3.0
gatsby-source-filesystem: ^2.2.5 => 2.11.0
gatsby-transformer-remark: ^2.7.5 => 2.16.0
gatsby-transformer-sharp: ^2.4.7 => 2.12.0
npmGlobalPackages:
gatsby-cli: 2.19.1