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In Chart.js the Y axis is determined by the property datasets see the documentation which can come from the bank or inserted in hard code as is done in the example below.
var barData = {
labels: ["Janeiro", "Fevereiro", "Março", "Abril", "Maio", "Junho", "Julho"],
datasets: [{
fillColor: "#48A497",
strokeColor: "#48A4D1",
data: [10, 20, 30, 40, 50, 60, 80]
}]
}
var income = document.getElementById("graficoBar").getContext("2d");
new Chart(income).Bar(barData);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<canvas id="graficoBar" width="600" height="400"></canvas>