Depends. Slow development frameworks such as react or vue may take a while. Vanilla js with something like axios should be straight forward. All you need is calls back and forth to your server to fetch and apply data. A trivial thing.

Edit: However, my challenge is on wether it can be done or not. Delphi is cool, and tbh any tool you are an expert in will let you do something quicker than a tool thats new for you. It will probably take me a while to achieve the same goal in delphi.