PHP form: How not to send name of input if value empty?

i am searching already since two days. I have a simple PHP contact form. Is it possible to "not" send the "name" of an text field, if it´s empty (no value)?

for example i have:

<form action="{form-action}" method="post">
<input type="hidden" name="send" value="1" />
    
<label for="Name">{Name}</label>
<input type="text" name="Name" id="Name" maxlength="100"/>

<label for="Optional">{Optional}</label>
<input type="text" name="Optional" id="Optional" maxlength="100"/>
    
<input type="submit" value="{submit}" />

</form>

PHP:

<?php

if (!isset ($_POST['send'])) {
    
  #Form has not been sent yet
  #Create contact form
  // ....
        
                
} elseif ($_POST['send'] == 1) {
    #Form has been sent

    #Check user input
    $noerrors = true;
    $msg = '';

    if ($_POST['Name'] == '') {
        $noerrors = false;
        $msg .= "Please input Name";
    }

    if ($noerrors == false) {
        #Errors have been found
        echo $msg;
    } else {
        #No errors, create and send mail
        if (is_array($_POST)) {
            foreach ($_POST as $key => $value) {
                if ($key != 'send') {
                    $mail_body .= "<span>$key</span><span>$value</span>";
                }
            }
        }

        #Get mailer from settings
        //...
    
        #Display message after mail is sent
        echo "Thank you!";
    }
}
?>

The result in the E-Mail for example:

Name (Example) Optional

But I would like to not show the name of the Input if there is no value. Is this possible? Does someone know how?