Changed visual object instance

Hi

1)I add my data to visual object instance [].

instances.push({
objectName: 'dataPoint',
displayName: resourceJob.label,
selector: resource.identity.getSelector(),
properties: {
fill: { solid: { color: resourceJob.color } }
},
});

2)They appear in power Bi

Data colors in Bi

3) Now after i change change color. How do i find the changed object. I need to know- to what color it has changed to, so that i can change data colors on my visual.

4)I am not using categorical data structure. I am using matrix

Thanks