Integrating FancyBox on page within Journal 3 / OC 3.x

I'm upgrading our site from OC 1.5.6.4 using the Journal 3 theme. What I need to do is create a stand alone page that has an image gallery of a responsive thumbnail grid with image zoom. (Think paint color swatches.) I think FancyBox would be a good solution. Journal 3 doesn't support this but they say they have a Dynamic Blocks feature that allows one to add HTML to any page. Their documentation is a bit thin and I'm not a programmer. I'd like to take a stab at this as we have no budget for a developer. What I'm looking for here is the big picture. Does the Journal 3 framework call pure html that I embed in a php page or do I create something in TWIG and call that?

I'm hoping someone will have a vague understanding of how this works and give me the 20 thousand foot overview of what's going on?

Thanks

Public code block removed to avoid more issues.

Well, a commercial Extension (like Journal) usually is 'protected' Code,
and therefore not really a matter to be 'handled' around this Place. Or
then better in the commercial Section, where paid Code Mods belong.

Good Luck, nothing personal, just plain information.
Ernie

Good point however that code is on their public website at the link i provided. I did not provide anything one cannot get after a simple google search.
Now.. Any advise for me or am I now a pharia?

Dynamic Blocks feature that allows one to add HTML to any page

OpenCart3 already has this, too, no need to use Journal3 for this feature.

Anyway, Journal3 is not free, neither is it well implemented, therefore any changes to it would be a commercial request.

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