How can I add a dynamic size chart to my product variant box?

I´m trying to add a “Size Chart” on the same level as the “Variant” Text.

Also because of the many different products, I need different Size Charts like I currently do with metafields.

Also I need a little text that shows the customer the size the model is wearing, which is also changing depending on the product.

Is there a way to edit the variant box this way?