If you are making a client editable region, they will have to manually add ALT tags.
Shopify Image upload will not let you tag Shopify hosted assets.
ADA Name will appear with QA and scoring.
{% for block in section.blocks %}{% if block.type == "slidertop" %}<div class="first-slide__bg-two w-slide" {{block.shopify_attributes}}><img src="{{ block.settings.slide_image | img_url: '2500x2500' }}" loading="lazy" alt="{{ block.settings.alt_text_slider }}" class="image-46"></div>{% endif %}{% endfor %}
W3C Standards and Guidelines
Shopify recommendations
Portfolio
Github