Gallery output image tags?

Question

MODX

There is a gallery of works with js filter on isotope
Album one. Each photo has a tag (Tag). Those. I want to filter photos of one album by these tags (Tags).
In the code for the isotope filter, you need to display the names of the tags in sequence.

<li ><a href="#filter" data-option-value=".тег картинки" title="View all post filed under ">тег картинки</a>

Image element code on the page:

<div data-category="Тег картинки " class="Тег картинки  element portfolio_item item" style="position: absolute; left: 244px; top: 0px;">
                            <div class="innerpadding">
                                <div class="portfolio_item_img featured_item_fadder">
                                    <a href="http://">
                                        <img src="http://.jpg" alt="">
                                    </a>
                                </div>
                            </div>
                        </div>

the first tag and the second tag, this is just an example. In reality there will be: cars, bicycles, etc. all the tags of this album.
The second day I'm trying to figure out how to display the image tag in the code :(