Hi hemeljon.
So my guess is that you want to use the Hueman theme to set up a merchandising website which shows lots of products, and your plan is to use one post for each product.
When you do that you can set a ‘Featured image’ for each post/product. You goal is to show the price of the product on the image in the category pages, correct?
When you upload an image to WordPress there are four pieces of Metadata you can add with the image:
1) Title
2) Alt-Text
3) Caption (by default appears on the image in large white letters on the post page)
4) Description ( by default appears on the image in smaller text in the post page)
Now, by default the CATEGORY pages do not display any of this information. even the ‘Alt-Text’ is swapped out for the post title.
The only item overlaid on the image in Category pages is the number of comments. This is handled in code lines 15 to 17 in the file content.php (and I recommend using a child theme before you go and modify).
So one option is to use one of the 4 image metadata fields listed above to store the price… this might be a weird shortcut, but would work.
Either way what you are looking to do is not supported out of the box and will take a bit of PHP work, but nothing that can’t be managed with child-theme files.
I hope this helps point you in the right direction.