How to add a group column to the customers page in the PrestaShop Back Office

prestashop_group_column_for_customers.php

<?php
public function install()
{
    if ($this->registerHook('actionCustomerGridDefinitionModifier') &&
        $this->registerHook('actionCustomerGridQueryBuilderModifier')) {
        return true;
    }

    return false;
}

public function hookActionCustomerGridDefinitionModifier(array $params)
{
    /** @var GridDefinitionInterface $definition */
    $definition = $params['definition'];

    $groupChoices = [];
    $groups = Group::getGroups(1);
    foreach ($groups as $group) {
        $groupChoices[$group['name']] = $group['id_group'];
    }

    $definition
        ->getColumns()
        ->addAfter(
            'optin',
            (new DataColumn('group_name'))
                ->setName('Group')
                ->setOptions(
                    [
                        'field' => 'group_name',
                    ])
        );

    $definition->getFilters()->add(
        (new Filter('group_name', ChoiceType::class))
            ->setTypeOptions([
                'choices' => $groupChoices,
                'expanded' => false,
                'multiple' => false,
                'required' => false,
                'choice_translation_domain' => false,
            ])
            ->setAssociatedColumn('group_name')
    );
}

public function hookActionCustomerGridQueryBuilderModifier(array $params)
{
    $searchQueryBuilder = $params['search_query_builder'];

    $searchCriteria = $params['search_criteria'];

    $searchQueryBuilder->addSelect(
        'grl.name as group_name'
    );

    $searchQueryBuilder->leftJoin(
        'c',
        '' . pSQL(_DB_PREFIX_) . 'group_lang',
        'grl',
        'grl.id_group = c.id_default_group AND grl.id_lang = 1'
    );

    if ('grl.name' === $searchCriteria->getOrderBy()) {
        $searchQueryBuilder->orderBy('grl.name', $searchCriteria->getOrderWay());
    }

    $searchQueryBuilder->groupBy('c.id_customer');
    foreach ($searchCriteria->getFilters() as $filterName => $filterValue) {
        if ('group_name' === $filterName) {
            $searchQueryBuilder->andWhere('grl.id_group = :group_name');
            $searchQueryBuilder->setParameter('group_name', "$filterValue");

            if (!$filterValue) {
                $searchQueryBuilder->orWhere('grl.name IS NULL');
            }
        }
    }
}