How do I get resolvers implementation on my plugin?

[hugo-marello-nutrien]

In which of the hooks available in the plugin definition can I get the implementation of my resolvers? My main idea is to build an object just like apollo-server would take as the 'resolvers' field.

Code example:

const Query = queryType({
    definition(t) {
        t.field('hello', {
            type: nonNull('String'),
            args: {
                name: stringArg()
            },
            resolve(_root, {name}) {
                return `Hello there, ${name || 'unknown'} from serviceA`;
            }
        });
});

And somewhere in the plugin I would like to build the object tree:

const resolvers = {};
function onResolverDeclaration(resolver) {
    resolvers[resolver.Name] = resolver.implementation;
}

The result should be something like:

const resolvers = {
    Query: {
        hello: (_root, { name }) => {
           return `Hello there, ${name || 'unknown'} from serviceA`;
        }
    }
}