How can i use reduce or any other array method, to count and sum up specific properties?

Question

I try to learn more about the array methods and also working with objects. I come up with this dummy example that simulate an incoming data.

    const data = [
  {
    id: 1,
    name: 'Company 1',
    sales: 100,
    status: 'win',
    brand: 'dell',
    year: 2020,
  },
  {
    id: 2,
    name: 'Company 2',
    sales: 300,
    status: 'lost',
    brand: 'dell',
    year: 2020,
  },
  {
    id: 3,
    name: 'Company 3',
    sales: 600,
    status: 'pending',
    brand: 'acer',
    year: 2021,
  },
  {
    id: 4,
    name: 'Company 3',
    sales: 800,
    status: 'pending',
    brand: 'lenovo',
    year: 2021,
  },
  {
    id: 5,
    name: 'Company 4',
    sales: 400,
    status: 'lost',
    brand: 'apple',
    year: 2020,
  },
  {
    id: 6,
    name: 'Company 1',
    sales: 1000,
    status: 'win',
    brand: 'apple',
    year: 2020,
  },
]

I would like to manipulate the information so i could come up with a new array like this:

    const projects = [
  {
    period: 2020,
    uniqueCompanies: 3,
    totalProjects: 4,
    totalSales: 1800,
    winStatus: 2,
    lostStatus: 2,
    winConversion: 0.5,
    lostConversion: 0.5,
    brands: [
      {
        brandName: 'dell',
        winProjects: 1,
        conversion: 0.25,
      },
      {
        brandName: 'apple',
        winProjects: 1,
        conversion: 0.25,
      },
    ],
  },
  {
    period: 2021,
    ....
  }
]

I almost succeeded, but i can't reduce the brands array to the desire structure.

      const reduceData = data.reduce((acc, project) => {
  const { year, name, status, sales, brand } = project;

  if (!acc[year]) {
    acc[year] = {
      companies: new Set(),
      totalProjects: 0,
      totalSales: 0,
      winStatus: 0,
      lostStatus: 0,
      winConversion: 0,
      lostConversion: 0,
      brands: [],
    };
  }

  acc[year].companies.add(brand);
  acc[year].uniqueCompanies = [...acc[year].companies].length;
  acc[year].totalProjects = (acc[year].totalProjects || 0) + 1;
  acc[year].totalSales = acc[year].totalSales += sales;
  acc[year].winStatus =
    status === 'win' ? acc[year].winStatus + 1 : acc[year].winStatus;
  acc[year].lostStatus = acc[year].totalProjects - acc[year].winStatus;
  acc[year].winConversion = acc[year].winStatus / acc[year].totalProjects;
  acc[year].lostConversion = acc[year].lostStatus / acc[year].totalProjects;

  acc[year].brands.push({
    brandName: brand,
    totalSales: sales,
  });

  return acc;
}, {})

Please help me understand the logic of it!