The mentioned "Hot Update" likely refers to "In-app updates", which are currently very common in large-scale mobile games. Mainstream commercial game engines also provide some mature solutions for this.
If the content you want to update consists of data files like JSON configurations, remote images, or similar resources, you could directly use AJAX to request these resources from a server and replace the corresponding objects in the runtime.
But for larger updates, such as event tables, scenes, etc. it is not currently possible in Construct.
In-app updates also implies risks as it can bypass the platform"s review process and directly publish application updates. Therefore, the Apple Store explicitly prohibits using this method to update games(App Review Guidelines).
Meanwhile, Google Play offers an In-app updates solution, which might be the closest legitimate approach.