Add PHP to home page as a block (?)

Hi,
Our client asked us to add 5 posts of another, car website.
The car website developers provided us with a .json file and we created a .php file.
Since there is no another way to add te content of the .php file, we created an iframe.
However, we loose the responsive design.
We would like to create something like a block to add our PHP code and add that block in the home page via tagComposer.
Here is our zip file which includes our PHP and CSS and here is our extra section we would like to add.

We would appreciate your valuable help.

Thanks in advance.