Hi,
It would be great if Figma supported outer focus as you have in CSS and HTML, especially on native input fields (see link below), or when a user uses their keyboard to tab between elements on a website.
developer.mozilla.org
You can make a hack to mimic it with a fixed position element that are x pixels larger than the object itself and then stretch it edge to edge via top to bottom and left to right (see screen capture). Not very scalable though.
Instead of inner and outer shadow, there could be an outer border, which could solve it in an easy way.