laravel，将变量赋值给模态的更简洁方法

I'm on a "blade" page that have:

<a
type="button"
data-passage="{{$passage}}"
class="btn btn-warning btn-xs editPassageButton"
data-toggle="modal"
data-target="#editPassage">Edit</a>

Then a modal like:

<div class="modal fade" id="editPassage"
                 tabindex="-1" role="dialog"
                 aria-labelledby="favoritesModalLabel">
                <div class="modal-dialog" role="document">
                    <div class="modal-content">
                        <div class="modal-header">
                            <button type="button" class="close"
                                    data-dismiss="modal"
                                    aria-label="Close">
                                <span aria-hidden="true">&times;</span></button>
                            <h4 class="modal-title"
                                id="addPassageLabel">Modifica Brano</h4>
                        </div>
                        <div class="modal-body">
                            @php
                                $passage =  "?????????";
                            @endphp

                            {{ Form::model($passage, array('route' => array('passage.update', 'null'), 'method' => 'POST')) }}

etc. etc.

Then a script part like this:

$(function() {
         $('.editPassageButton').on("click", function (e) {
             passage = $(this).data('passage');
         });


     });

And it works properly, so I cannot well understand how to send it to the php variable on the modal (the part with ???????). I found several post that suggest to send it trough a form, but it seem tricky to me, and for Laravel how it works? do i need to add a route in that case? no cleaner way to do it? I know how to pass single variable to a modal form, but i prefer to using the variable that is the model that i need to update...