How to get proper type support for imported custom elements?

[backfromexile]

In my project I am using a bunch of custom elements from another package.
The library exports types that support an augmentation of HTMLElementTagNameMap. Die to the library allowing for a custom prefix thief library itself cannot augment the Tag name map.
However, In all cases I tried I don't get proper type support for props or events, Vue barely accepts the in tag itself.

The elements are defined as so for example

declare global {
    interface HTMLElementTagNameMap {
        'my-element': HTMLElement & {
            value?: number;
            label?: string;
        }
    }
}

But this and any other augmentation I tried has no real effect.

How do I make type checking and autocompletion/intellisense work with custom elements when they are used in Vue?