I have created Small module. It will help you.
Create module files which are listed below.
app/code/Kunj/Critic/etc/module.xml:
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Kunj_Critic" setup_version="2.0.0"></module>
</config>
app/code/Kunj/Critic/Model/Critic/Options.php
<?php
namespace Kunj\Critic\Model\Critic;
class Options implements \Magento\Framework\Option\ArrayInterface
{
public function toOptionArray()
{
return [
[
'value'=>1,
'label'=>"My Option"
],
[
'value'=>2,
'label'=>"My Option 2"
],
[
'value'=>3,
'label'=>"My Option 3"
],
[
'value'=>4,
'label'=>"My Option 4"
],
[
'value'=>5,
'label'=>"My Option 5"
]
];
}
}
app/code/Kunj/Critic/view/adminhtml/ui_component/product_form.xml
<?xml version="1.0" encoding="UTF-8"?>
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
<fieldset name="product-details">
<field name="critic_lists" sortOrder="300" formElement="select">
<argument name="data" xsi:type="array">
<item name="options" xsi:type="object">Kunj\Critic\Model\Critic\Options</item>
<item name="config" xsi:type="array">
<item name="source" xsi:type="string">block</item>
</item>
</argument>
<settings>
<validation>
<rule name="required-entry" xsi:type="boolean">true</rule>
</validation>
<dataType>select</dataType>
<label translate="true">Critic Lists</label>
<dataScope>critic_lists</dataScope>
</settings>
</field>
</fieldset>
</form>
app/code/Kunj/Critic/registration.php
<?php
\Magento\Framework\Component\ComponentRegistrar::register(
\Magento\Framework\Component\ComponentRegistrar::MODULE,
'Kunj_Critic',
__DIR__
);
After create module run :
php bin/magento setup:upgrade