soupStrainer.js

// moustache replacement
const soupStrainer = (template, values) =>
  [...template.matchAll(/\{\{([^}]*)\}\}/gi)].reduce(
    (acc, [full, path]) =>
      acc.replace(
        full,
        path.split(`.`).reduce((acc, curr) => acc[curr], values)
      ),
    template
  )

// your values to swap in
const values = {
  dealership: {
    name: `Joel's Shonky Dealership`,
    street: `Shonk Avenue`,
  },
}

// your template string
const template = `At {{dealership.name}} located on {{dealership.street}}`

// how to use soupStrainer
const result = soupStrainer(template, values)

console.log(result)