class location(models.Model):
    loc_room = models.CharField(max_length=20, blank=True, null=True)
    loc_block = models.IntegerField(blank=True, null=True)
    loc_shelf = models.CharField(max_length=4, blank=True, null=True)

class box(models.Model):
    box_contents = models.CharField(max_length=300, blank=True, null=True)
    project_assigned_to = models.ForeignKey('project', null=True)
    location_id = models.ForeignKey('location', null=True)

def all_assets(request):
    box_data = box.objects.all()
    return render(request, 'main_app/all_assets.html', { "box_data":box_data })

<thead>
    <tr>
        <th>Assets</th>
        <th>Project</th>
        <th>Room</th>
        <th>Block</th>
        <th>Shelf</th>
    </tr>
</thead>
<tbody>
    {% for item in box_data %}
    <tr>
    <td>{{ item.box_contents }}</td>
    <td>{{ item.project_assigned_to }}</td>
    <td>**Here I need to add data from ROOM**</td>
    <td>**Here I need to add data from BLOCK**</td>
    <td>**Here I need to add data from SHELF**</td>
</tr>
{% endfor %}