Here is how you would add it to the default attributset, with a group name you can define (or you use an existing group name, like **Product Details**):

    $attributeGroup = 'My Group Name'; // the group doesn't need to exist

    $attributeCode = 'customer_product_points'; // or whatever attribute you want to add

    $entityTypeId = $eavSetup->getEntityTypeId(
        \Magento\Catalog\Api\Data\ProductAttributeInterface::ENTITY_TYPE_CODE
    );

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

    $eavSetup->addAttributeToSet($entityTypeId, $attributeSetId, $attributeGroup, $attributeCode);




Another option would be to add `'groups' => 'my group name'` to your attribute array, it would then automatically be added to **all** attributsets.