Any idea how to inject a MUI createTheme into CSUI?

    <CacheProvider value={styleCache}>
      <ThemeProvider theme={mysterianTheme}>
        <AppPage />
      </ThemeProvider>
    </CacheProvider>

    <CacheProvider value={styleCache}>
      <ThemeProvider theme={mysterianTheme}>
        <AppPage />
      </ThemeProvider>
    </CacheProvider>