app/bundles/CampaignBundle/DataFixtures/ORM/CampaignData.php

<?php

namespace Mautic\CampaignBundle\DataFixtures\ORM;

use Doctrine\Common\DataFixtures\AbstractFixture;
use Doctrine\Common\DataFixtures\OrderedFixtureInterface;
use Doctrine\Persistence\ObjectManager;
use Mautic\CampaignBundle\Entity\Campaign;

class CampaignData extends AbstractFixture implements OrderedFixtureInterface
{
    public function load(ObjectManager $manager): void
    {
        $campaign = new Campaign();

        $campaign->setName('Campaign A');
        $campaign->setCanvasSettings([
            'nodes' => [
                0 => [
                    'id'        => '148',
                    'positionX' => '760',
                    'positionY' => '155',
                ],
                1 => [
                    'id'        => 'lists',
                    'positionX' => '860',
                    'positionY' => '50',
                ],
            ],
            'connections' => [
                0 => [
                    'sourceId' => 'lists',
                    'targetId' => '148',
                    'anchors'  => [
                        'source' => 'leadsource',
                        'target' => 'top',
                    ],
                ],
            ],
        ]
        );

        $manager->persist($campaign);
        $manager->flush();
    }

    /**
     * @return int
     */
    public function getOrder()
    {
        return 0;
    }
}