How to pass 'fieldset' inputs to C# sketch - input

Question

I used HTML input form to pass single parameter to my C++ sketch to switch relay ON/OFF. my need now is to use fieldset and pass multiple parameters to my C++ sketch. my question is why the 5 input parameters do not pass to the global variable I'm using? I like to know how the input of the webpage shall pass to the C++ sketch. or how to save the inputs of 'fieldset' into the global variable I'm using.
Note: My sketch running on ESP-01s processor.
Thanks
MBD.
I tried the HTML single input form which does work fine.
<form action="/get">
Garden ZONE : <input type="number" name="ZONE" size="10"><br>
<input type="submit" value="Submit"><br>
</form><br>
When I click submitt the fieldset input form with multiple inputs echo the input correctly on the webpage on my phone screen.
</script>
<form class="" action="index.html" method="post">
<label for="Zone">Zone#:</label>
<input type="text" name="array[]" value="" /><br><br>
<label for="Zone">DayofWk:</label>
<input type="text" name="array[]" value="" /><br><br>
<label for="Time">Time_HH:</label>
<input type="text" name="array[]" value="" /><br><br>
<label for="Time">Time_MM:</label>
<input type="text" name="array[]" value="" /><br><br>
<label for="Dur">Duration:</label>
<input type="text" name="array[]" value="" /><br><br>
<button type="button" name="button" onclick="Disp_Array()">
Submit
</button>
</form>
<p id="par"></p>
<script type="text/javascript">
var k = "The respective values are :";
function Disp_Array() {
var input = document.getElementsByName('array[]');
for (var i = 0; i < input.length; i++) {
var a = input[i];
k = k + "array[" + i + "].value= " + a.value + " ";
}
document.getElementById("par").innerHTML = k;
document.getElementById("po").innerHTML = "Output";
for (var i = 0; i < input.length; i++) {
var a = input[i];
k = k + "array[" + i + "].value= " + a.value + " ";
} }
</script>
The above is part of the c++ sketch.
How to pass value of the Array[i] to global variable of C++ section.