Adding accordion to the label groups

a) I have reported about the bug where typing in value (multi -select-list) gives incorrect result, still no answer or solution unfortunately, see post here:
https://www.joomlart.com/forums/d/7536-typing-in-value-gives-incorrect-results
b) I have requested a feature, the "load more" feature, which is really needed when using checkbox buttons with many items, just like in megafilter, still no solution unfortunately. see post here:
https://www.joomlart.com/forums/d/7467-more-link-when-many-items-tags-just-like-megafilter

I really need a solution quickly with Ja- k2 filter. As it is right now:
1 I cant use multi -select-lists since they give me incorrect results, see a)
2 I cant use checkbox buttons without a load more feature, since i have 200+ tags etc, this will look ridicoulus..

HOWTO: Temporary solution / Own tweak
I have switched to using checkbox buttons, this way i can avoid the typing issue bug, so i came up that i could put my filter group labels inside accordions, this way i looks much more decent.

I have tweaked the file modules/mod_jak2filter /tmpl/default.php, line 172-177 and put the tag group label inside an accordion (UIKIT) and it looks really good.

i changed from this:

<div class="subclass">
<label class="group-label"><?php echo $filter_by_tags_label; ?></label>
<?php echo $filter_by_tags_display; ?>
</div>

to this:

<ul uk-accordion>
    <li>
        <a class="uk-accordion-title" href="#">Tags</a>
        <div class="uk-accordion-content">
<div class="subclass">
<label class="group-label"><?php echo $filter_by_tags_label; ?></label>
<?php echo $filter_by_tags_display; ?>
</div>
</div>
    </li>
</ul>

QUESTION
But i also have some extra fields, and unfortunatley i cant find where to do this same tweak on theese Extra Fields, do you know which file i need to modify ?

Cheers and thank you