Hi Andre Teixeira,
Not a solution but came up with some findings & approach that may solve your Issue:

1- Use the forge-component: https://www.outsystems.com/forge/component-overview/3079/edit-plist-file-plugin
Add a new config via the plugin, which will solve your issue for iOS.

<config-file parent="UIUserInterfaceStyle" platform="ios" target="*-Info.plist">
    <string>Light</string>
</config-file>   

or

2- Use the repo on mobile to detect the active-mode whether dark/light
     https://www.npmjs.com/package/cordova-plugin-darkmode
And then populate your CSS accordingly using prefers-color-scheme the media feature.
https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme

.day   { background: #eee; color: black; }
.night { background: #333; color: white; }

@media (prefers-color-scheme: dark) {
  .day.dark-scheme   { background:  #333; color: white; }
  .night.dark-scheme { background: black; color:  #ddd; }
}

@media (prefers-color-scheme: light) {
  .day.light-scheme   { background: white; color:  #555; }
  .night.light-scheme { background:  #eee; color: black; }
}

Hope it helps,
Assif