Jekyll: Dealing with Images in Markdown

I've got a design for my post page that is made up of text and images, more specifically, galleries. Take a look at the illustration below:

I've got these galleries set up my front matter like so:

---
gallery-1:
  rows:
    - images:
      -  { url: '1.jpg'}
    - images:
      -  { url: '2.jpg'}
      -  { url: '3.jpg'}
gallery-2:
  rows:
    - images:
      -  { url: '4.jpg'}
      -  { url: '5.jpg'}
---

Is there a way to print these galleries to the page on my .md file. I know the code below won't work, but something similar?

This is my markdown

[gallery-1]

This is more markdown

[gallery-2]

Is something like this possible with Jekyll?

Any help with this is appreciated. Thanks in advance!

First, let's simplify your yaml front matter :

---
galleries:
 # gallery number one
 1:
   # row one in gallery one
   -
     - { url: '1.jpg', alt: 'alt 1'}
   # row two in gallery one
   -
     - { url: '2.jpg', alt: 'alt 2'}
     - { url: '3.jpg', alt: 'alt 3'}

 # gallery number two
 2:
  # row one in gallery two
   -
     - { url: '4.jpg', alt: 'alt 4'}
     - { url: '5.jpg', alt: 'alt 5'}

other front matter like title, ...
---

Your .md file :

Markdown
{% include gallery.html  gallery=1 %}
Other markdown
{% include gallery.html  gallery=2 %}

And then the _includes/gallery.html file :

{% comment %}-----------------
  - This page receives a gallery index (include.gallery)
  - It then assign the gallery[include.gallery] to the rows variable
%}-----------------{% endcomment %}
{% assign rows = page.galleries[include.gallery] %}

{% comment %}%}-----------------
  We now loop over rows
%}-----------------{% endcomment %}
{% for row in rows %}
<div class="row">
    {% comment %}%}-----------------
      and then loop over images in row
    %}-----------------{% endcomment %}
    {% for img in row %}
        <p>src="{{ site.baseurl }}{{ img.url }}" alt="{{ img.alt }}"</p>
    {% endfor %}
</div>
{% endfor %}

See yaml documentation And Jekyll template documentation