Environment

• nativescript: 8.0.2
• @nativescript/core: 8.0.8
• @nativescript/android: 8.0.0
• @nativescript/ios: 8.0.0

Describe the bug
Could not set label and button colors for Dialogs via css (to handle dark mode colors)

To Reproduce

• run: ns create ...
• add somewhere a Dialog.alert('Hi')
• replace the scss as followed:

Page {
  Label,
  Button {
    color: gray;
  }

  &.ns-dark {
    Label,
    Button {
      color: white;
    }
  }
  &.ns-light {
    Label,
    Button {
      color: black;
    }
  }
}

Label,
Button {
  color: blue;

  &.ns-dark {
    color: yellow;
  }
  &.ns-light {
    color: green;
  }
}

Result on Android

Result on iOS

Expected behavior

• in light mode, the Dialogs text and button colors should be black or green in light mode and white or yellow in dark mode
• without dark/light mode support they shloud be gray or blue;

Sample project
Playground is useless, because it it's last version runs on NS 6.5 (released a year ago).

Additional context

• the lbl and btn have no page or parentNode, so the css selectors Page Label and Page Button fail (described here: Dialogs: Provide ability to set different color/font style for title #3830 (comment))
• the lbl and btn have no ns-light or ns-dark css-class, so there is no possibility to set different colors via css.
• on android and ios the color property of lbl and btn is:

color: {
  _argb: 4278190335
  _name: "blue"
  a: 255
  android: -16776961
  argb: 4278190335
  b: 255
  g: 0
  hex: "#0000FF"
  ios: undefined
  name: "blue"
  r: 0
}

there are a some existing issues about this problem, wich are opend over moths, like:
#8484
NativeScript/theme#184

Summarized:

• no chance to apply custom colors for dark mode on both platforms (this is realy bad -> dialogs are not usable in dark mode)
• on android in dark mode gets generated "magically" a custom color (but at least is a bit lighter and could be used in dark mode)
• If I'm not wrong, this issue could not be solved, by css (and @nativescript/theme)