Is nesting of styles supported on svg object with external css?

Question

css

There is svg. First, I set xml and the path to the style file.
I connect through object.
In styles, I registered a class that is in svg.
If written without nesting, for example, .icon-rouble(inside svg) { fill: #000; }, then everything works.
If written with nesting, for example, .wrapper(div) > .svg-icon(object) > .icon-rouble(inside svg) { fill: #000; }, then it doesn't work anymore.
What then is the point of such use, if it does not see external classes, can it be overcome?