'Merging and use both of default flutter ThemeData with NeumorphicThemeData

I was developing an app with neumorphic design and decide to use flutter_neumorphic package. I got some problem when give a theme, neumorphic package give an easier way to set the default style for neumorphic, but in other side i can't use the default ThemeData anymore. Meanwhile some property of ThemeData did'nt exist on NeumorpchicThemeData, e.g. buttonTheme, default font family, etc. How should i do with them, could i just combine two of them, or should i choose one of the theme class and then make a constants to create a new separated theme for one of them?



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