Vous pouvez faire comme ça
var isGateOpen = datasources["V4"]["response"]["in"][0] == 0;
var color = `color: #${ isGateOpen ? 'f00' : '0f0' };`;
return `
<div class="widget" style="${color}">
<div class="tw-display">
<div class="tw-tr">
<div class="tw-value-wrapper tw-td">
<span class="glyphicons glyphicons-${ isGateOpen ? "warning-sign": "autre-icone" } x2"></span>
</div>
<div class="tw-value" style="font-size: 20px; margin: 15px 0 0 10px;${color}">
POSTE RIA ${ isGateOpen ? "DEFAUT" : "OK" }
</div>
</div>
</div>
</div>
`;