Level Chunk for infinte 2D runner

Currently I have an infinite runner that uses object pooling to spawn floors with no gaps, obstacles and platforms that are in the air and can be jumped onto.

The floor is spawning at a constant rate. The obstacles and platforms are spawning at random ranges (spawnMin, spawnMax).

I want to make my game more interesting by adding level chunks similar to the chunks in word ninjas. https://www.youtube.com/watch?v=VkGG9Umag0M

For example one of my platforms spawn in a particular pattern

for example:

      platform platform
 
 platform platform platform

and another could be

            coin  
 platform platform platform
          obstacle
 platform platform platform

(The real chunks will be larger)

how could I go about creating level chunks similar to wordNinjas?