Possibility to assign 2x assets through QT Bridge

When exporting graphic assets through QT Bridge,
the bridge has the option of exporting both a "1x" and a "2x" version of the asset.

However, in the output .metadata file, the "2x" version is not referred anyway but for example iOS and macOS use these automatically.

User has requested that there would be possibility to assign these assets if some conditions are met like high dpi screen in use.