Webstorm is not expanding types in tooltip

I have the following interface:

I'm creating a JavaScript Proxy object so that I can have the following api:

I'm typing this proxy object as:

The issue arises in the tooltip:

I expect the tooltip to show me the expanded types of what I can input here.

Example of expectation from VS Code:

Video here: https://youtu.be/Aa0yNdklNhM