To apply a specific color on text/color in a form like this :
You will have to use the Cell class attribute of your column :
Use a Javascript expression to choose which CSS class has to be applied :
For example this ternary function :
row.__modif_user_login == ‘administrateur’ ? ‘green-cell’ : ‘red-cell’
It means : if the user is administrateur, it will apply green-cell, else it will apply red-cell.
You can also compute the correct CSS class in the database (in the model), and just for each line choose row.my_css_class instead.
Then just compute your style in V1 custom form attribute :
<style>
.green-cell span { color : green }
.green-icon i { color : green !important }
.red-cell span { color : red }
.red-icon i { color : red !important }
</style>
Do not forget : on icon you have to add !important because style is overriden by default