Get items which are related in 1 call

I have 2 content types:

governanceGroup and people

People can belong to multiple governanceGroups

I want to get in 1 request the people who are assigned to the requested governance group

How do I change this? Linked doesn’t bring them back.

            'content_type': 'governanceGroup',
            'fields.slug': slug
    .then(([n]) => {
        group = n.items[0];

        res.render('corporate/who-we-are/group', {
    .catch(error => {

Within the CMS, it shows the linked people (Peter Parker) - I want to get a response which contains the governance type and the people