How to make a property in an object dynamic?

Question

React

export default {
    mainKey: '_id',
    fields: {
        _id: {
            title: 'ID',
            type: 'string',
        },
        pricingType: {
            title: 'Pricing Type',
            type: 'array',
            editing: {
                default: ['CPM'],
                options: [{ value: 'CPM', label: 'CPM' }, { value: 'Rev Share', label: 'Rev Share' }],
            },
        },
        pricingValue: {
            title: 'Pricing Value',
            type: 'float',
            editing: {
                max: 20,
            },
        },
    },
};

the 'max' value in pricingValue depends on what value will be selected in the pricingType dropdown.
i.e. if pricingType = CPM -> max = 20,
if pricingType = Rev Share -> max = 1;
How can this be implemented?