There is such a plugin, theme-options, but he is too tricky.
I use the same plugin carbon-fields.
Saw in one video, how to set up the plugin, theme-options so that you can add a field on the post page dynamically.
For example, there are advantages and the 4 elements. You create the settings for one block that has the title, text and image in a loop and then output these blocks. And on the page, can add dynamically how many blocks you want.
Here is a link to a video time reference for the plugin theme-options https://youtu.be/pInL839c-QU?list=PLzFj4L-LMRzszss...
How to make the same behavior for the plugin carbon-fields?
Hope you get the idea))
Thanks in advance.