QSS - Do not override ForegroundRole in QTreeView

[CloudCompany]

Hello!

I encountered an issue since last week.
I have a QStyleSheet which some default behavior for QTreeView (colors, borders...).
But in some cases, I would like to punctually change the color of the text, in order to highlight bad values for exemple, and I made this changes in ForegroundRole in data() method.
The problem that the ForegroundRole is completely ignored and it is the QSS attribute which is used.

Example:

QTreeView {
   color: black;
}

QTreeView {
   color: black;
}

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QVariant data()
{
   ...
   case Qt::ForegroundRole:
      return QBrush(Qt::Orange);
}

QVariant data()
{
   ...
   case Qt::ForegroundRole:
      return QBrush(Qt::Orange);
}

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Orange is never applied and I would like to.

Thanks for your future answers!