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I want to pass custom option values from product detail page to cart page in magento2.

Refer screenshot

I have selected here size: 5 and want to pass the value to cart page.

Here is my code:

<?php
 if (!$cartItem):
 //echo"Amyyyyyyyyyyyyyyyyyyy";
 foreach ($currentProduct->getOptions() as $option) 

 //echo $option['label'].'=>'. $option['value'].

 if ($option->getTitle() == 'Ring Size') 
 $values = $option->getValues();
 $name = "options[" . $option->getId() . "]";
 ?>
 <br>
 <div class="drop-down5"> 
 <select name="options" id ="ringSize"> 
 <option>SELECT SIZE</option>
 <option value="5">SIZE: 5</option>
 <option value="5.5">SIZE: 5.5</option>
 <option value="6">SIZE: 6</option> 
 <option value="6.5">SIZE: 6.5</option> 
 <option value="7">SIZE: 7</option> 
 <option value="7.5">SIZE: 7.5</option> 
 <option value="8">SIZE: 8</option> 
 <option value="8.5">SIZE: 8.5</option> 
 <option value="9">SIZE: 9</option> 
 </select>

 <?php echo "<input type= 'hidden' name = " . $name . " id = 'ringSizeText' > "; ?>

 </div>
 <?php
 
 
 endif;
 ?>

In checkout cart page default.phtml

<?php if ($_options = $block->getOptionList()): 
 ?>
 <?php foreach ($_options as $_option) : ?>
 <?php if($helper_sdi->isInEngravingCustomOptions($_option['label'])) continue; ?>
 <?php $_formatedOptionValue = $this->getFormatedOptionValue($_option); ?>
 <?php endforeach; ?>
 <?php endif; ?>


 <!--Foreach statement code start-->
 <?php if(!empty($_formatedOptionValue)) 

 ?>
 <section class="grid-3-3 no-padding-right ring-size" style="text-align: center;">
 <?php if ($_options = $block->getOptionList()): ?>
 <dl class="item-options">
 <?php foreach ($_options as $_option) : ?>
 <?php if($helper_sdi->isInEngravingCustomOptions($_option['label'])) continue; ?>
 <?php $_formatedOptionValue = $block->getFormatedOptionValue($_option); 
 //print_r($_formatedOptionValue); 
 ?>
 <dt><?php echo $block->escapeHtml($_option['label']) ?></dt>
 <dd style="margin: 20px 0 0px 0;" 
 <?php if (isset($_formatedOptionValue['full_view'])): ?> class="truncated"<?php endif; ?> >
 <?php echo $_formatedOptionValue['value'] ?>
 </dd>
 <?php endforeach; ?>
 </dl>
 <?php endif; ?>
 </section>
 <?php ?>
 <p>fjhguityguihgjnhgf</p>

please someone help where I am making mistake.

Any help would be appreciated.