@APino you can host JSON files in Hubspot CMS and use it on a page, you just need a bit of JS to do it. That would probably be the easiest way around this, as you can have all your templates reference one file, and when you need to update it just replace the file. You can use fetch to get JSON:
fetch('[link to your JSON file in Hubspot]').then(response => {
return response.json();
}).then(data => {
// Do things with JSON data here
console.log(data);
}).catch(err => {
// Do something for an error here
});