customconfig.php

См. документацию.

<?php
 
namespace Bitrix\Main\Grid\Column\Editable;
 
use Bitrix\Main\Grid\Editor\Types;

class CustomConfig extends Config
{
    private ?string $html;

    public function __construct(string $name, ?string $html = null)
    {
        parent::__construct($name, Types::CUSTOM);
 
        $this->html = $html;
    }

    public function setHtml(string $value)
    {
        $this->html = $value;
    }

    public function toArray(): array
    {
        $result = parent::toArray();
 
        if (isset($this->html))
        {
            $result['HTML'] = $this->html;
        }
 
        return $result;
    }
}