choropleth and accessing state via expressions

[colin-ryan-airm]

Hi, I'm trying to create a choropleth with mapbox that's dynamically colored based on user input (user inputs a year and data is loaded for that year). I'm rendering data from mapbox studio on my map and it includes several polygons, each with an id. In my application I want to change the colors of the polygons based on some selection (year, for example). If I stored the data in mapbox studio I know how I'd do this. I'd set the fill color to something like this:

'fill-color': [
'interpolate',
['linear'],
['get', 'population'],
0,
'#F2F12D',
500000,
'#EED322',
750000,
'#E6B71E',
1000000,
'#DA9C20',
2500000,
'#CA8323',
5000000,
'#B86B25',
7500000,
'#A25626',
10000000,
'#8B4225',
25000000,
'#723122'
],
'fill-opacity': 0.75
}```

However what I want to do is get the ID of the feature and lookup the data from another object. Is this possible? Is there a better way? Should I just generate custom geojson and add it from the application? Thanks.