Format the y axis of a CCC bar chart.

[wagneralbjr]

Hello, i'm having some trouble with number formatation, i can't fix this. i want to show the numbers with only one single decimal house. how can i do this?
i've already tryed to fix this writing a function in post fetch

function f(data){
    
    this.chartDefinition.format = {
        number: {
            mask: "#.0", 
            style: {
            decimal: ".",
            group: ","
            }
        }
    };
    
    return data;
}

but it didn't work, can you guys help me?