my-website/static/modversions/testingmod-updates.json

{
  "homepage": "https://gitlab.com/jotoho/mc-testingmod",
  "1.16.5": {
    "prealpha": "This 'version' has no changelog"
  },
  "promos": {
    "1.16.5-latest": "prealpha"
  }
}