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I want to add a new text area to my categories in Magento2, similar to this, but its for Magento 1: adding custom drop down field to category

Basically there should be a field for each category where my customer can put in some category-based SEO content. I want to echo it later on the sidebar.

How could I achieve this? Bonus points if I can achieve this with pure XML.

You need to create a module that has Setup/InstallData.php with content similar to

public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)

    {

        $installer = $setup;

        $installer->startSetup();



        $categorySetup = $this->categorySetupFactory->create(['setup' => $setup]);

        $entityTypeId = $categorySetup->getEntityTypeId(MagentoCatalogModelCategory::ENTITY);

        $attributeSetId = $categorySetup->getDefaultAttributeSetId($entityTypeId);

        $categorySetup->removeAttribute(MagentoCatalogModelCategory::ENTITY, 'bottom_description');

        $categorySetup->addAttribute(

            MagentoCatalogModelCategory::ENTITY, 'bottom_description', [

                'type' => 'text',

                'label' => 'Bottom description',

                'input' => 'textarea',

                'required' => false,

                'sort_order' => 101,

                'visible' => true,

                'wysiwyg_enabled' => 1,

                'visible_on_front' => 1,

                'is_html_allowed_on_front' => 1,

                'user_defined' => true,

                'global' => MagentoEavModelEntityAttributeScopedAttributeInterface::SCOPE_STORE,

                'group' => 'General Information',

            ]

        );

        $idg = $categorySetup->getAttributeGroupId($entityTypeId, $attributeSetId, 'General Information');

        $categorySetup->addAttributeToGroup(

            $entityTypeId,

            $attributeSetId,

            $idg,

            'bottom_description',

            46

        );



        //$installer->updateAttribute($entityTypeId, 'bottom_description', 'is_wysiwyg_enabled', 1);

        //$installer->updateAttribute($entityTypeId, 'bottom_description', 'is_html_allowed_on_front', 1);



        $installer->endSetup();

    }

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