Making bold text in JavaScript

I’ve never done something in JavaScript, thus apologies if my question is very basic.

I’m trying to manipulate (making words bold, or introducing numeration structure) the description (description:”____”) part in the following code.

module.exports = {
  siteTitle: 'Hi! I'm Francisco!',
  siteDescription: `Create your online curriculum in just a few minutes with this starter`,
  keyWords: ['gatsbyjs', 'react', 'curriculum'],
  authorName: 'Francisco Santos',
  twitterUsername: '_franciscodf',
  githubUsername: 'santosfrancisco',
  authorAvatar: '/images/avatar.jpeg',
  authorDescription: `Developer, passionate about what I do. Always interested in how the sites were made, I started to study HTML by hobby. <br />
    In 2012 I started working as a support technician and I approached the developers.
    In 2015, I started to study C # and started to contribute with the team giving maintenance in an application in C # and .NET. <br />
    I currently work as a frontend developer and mainly work with <strong>Javascript, NodeJS e React.</strong>`,
  skills: [
    {
      name: 'HTML',
      level: 70
    },
    {
      name: 'CSS',
      level: 60
    },
    {
      name: 'Javascript',
      level: 50
    },
    {
      name: 'NodeJs',
      level: 40
    },
    {
      name: 'React',
      level: 60
    },
    {
      name: 'Git',
      level: 70
    },
    /* more skills here */
  ],
  jobs: [
    /* more jobs here */
    {
      company: "Gympass",
      begin: {
        month: 'sep',
        year: '2019'
      },
      duration: null,
      occupation: "Frontend developer",
      description: "<b>str</b> I am <b>part</b> of the bold(Corporate team), responsible for the development and maintenance of the employee management platform, giving more and more autonomy to partner +43 677 62431314companies."
  
    },  {
      company: "Lendico",
      begin: {
        month: 'apr',
        year: '2018'
      },
      duration: null,
      occupation: "Frontend developer",
      description: "I integrate the Frontend team responsible for developing and maintaining the online lending platform."
  
    }, 
  ],

I’ve already tried the basic syntax to do that usually, but since this obviously doesn’t work, I’m wondering if there is a simple way to do it within the “description:”