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#!/usr/bin/perl
use warnings;
...
my $result = $action->($operand1, $operand2);
$result = int $result if $is_integer;
say $result;

[operation]
op = /
op1 = 10
op2 = 3
int = 1

dancer2 gen -a webapp

<form id="f1" method="post" action="/">

...

  <button>Sumbit</button>
</form>

<p>
Result: <% result %>
</p>

package Op;

...
}

__PACKAGE__

package webapp;
use Dancer2;
...
};

true;

plackup bin/app.psgi