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Original DOCX:
https://www.topport.it/media/8b897b82-89f5-48e3-8f9e-3d0bce905d93/ArticoloClelia.docx

My code:

$docxFinal = new CreateDocx();
$docxFinal->importContents('ArticoloClelia.docx', ['type' => 'paragraph']);
$docxFinal->embedFont('fonts/Roboto/roboto.ttf', 'Roboto');
$docxFinal->embedFont('fonts/Roboto/robotoi.ttf', 'Roboto', ['styleEmbeding' => 'Italic']);
$docxFinal->embedFont('fonts/Roboto/robotob.ttf', 'Roboto', ['styleEmbeding' => 'Bold']);
$docxFinal->embedFont('fonts/Roboto/robotobi.ttf', 'Roboto', ['styleEmbeding' => 'BoldItalic']);
$docxFinal->setDefaultFont('Roboto');

$defaultStyle = [
    'color' => '000000',
    'italic' => false,
    'bold' => false,
    'font' => 'Roboto',
    'fontSize' => (12 * 2),
    'textAlign' => 'both',
    'lineSpacing' => 360
];
$docxFinal->setDocumentDefaultStyles($defaultStyle);

$docxFinal->customizeWordContent(
    [ 'type' => 'style', 'target' => 'style', 'customAttribute' => '//w:body/w:r[1=1 and descendant::w:rFonts[contains(@w:ascii, "*")]]' ],
    [
        'color' => 'FF0000',
        'bold' => false,
        'italic' => false,
        'font' => 'Roboto',
        'fontSize' => 12,
        'lineSpacing' => 360,
        'spacingTop' => 90,
        'textAlign' => 'both'
    ]
);

$docxFinal->customizeWordContent(
    [ 'type' => 'style', 'target' => 'style', 'attributes' => ['w:*' => ['w:val' => 'ContenutoArticolo']] ],
    [
        'color' => '000000',
        'bold' => false,
        'italic' => false,
        'font' => 'Roboto',
        'fontSize' => 12,
        'lineSpacing' => 360,
        'spacingTop' => 90,
        'textAlign' => 'both'
    ]
);

$docxFinal->customizeWordContent(
    [ 'type' => 'style', 'target' => 'style', 'attributes' => ['w:*' => ['w:val' => 'TitoloCapitolo']] ],
    [
        'bold' => true,
        'italic' => false,
        'color' => '000000',
        'font' => 'Roboto',
        'fontSize'=> 14,
        'lineSpacing' => 240,
        'spacingTop' => 360,
        'spacingBottom' => 240,
        'textAlign' => 'both'
    ]
);

$docxFinal->customizeWordContent(
    [ 'type' => 'style', 'target' => 'style', 'attributes' => ['w:*' => ['w:val' => 'TitoloSottoCapitolo']] ],
    [
        'bold' => false,
        'italic' => true,
        'color' => '000000',
        'font' => 'Roboto',
        'lineSpacing' => 240,
        'textAlign' => 'both'
    ]
);

$docxFinal->customizeWordContent(
    [ 'type' => 'style', 'target' => 'style', 'attributes' => ['w:*' => ['w:val' => 'NoteArticolo']] ],
    [
        'color' => '000000',
        'font' => 'Roboto',
        'fontSize'=> 8,
        'lineSpacing' => 240,
        'textAlign' => 'both'
    ]
);

$docxFinal->modifyPageLayout('A4',[
    'marginTop' => $this->cm2twips(3.5),
    'marginBottom' => $this->cm2twips(3.5),
    'marginLeft' => $this->cm2twips(4.5),
    'marginRight' => $this->cm2twips(4.5),
]);

$docxFinal->createDocx('ArticoloClelia_final.docx');

Final document:
https://www.topport.it/media/8b897b82-89f5-48e3-8f9e-3d0bce905d93/ArticoloClelia_final.docx

Note:
The script change color of text but not the font. I tried to change the "type" and "target" in all possible values but no changes.