Sorry, but Word is not magical, nor does it read minds. It does exactly what it is told to do. So "automatically" may be possible, but you would have to determine PRECISELY every single possible rule and situation in advance, and tell Word PRECISELY what to do.

Shrug, may be possible but are you willing to put hours of work testing things to make sure it works the way you want?

Looking at what you have, you want to start with doing a justify to start. Clearly though your examples are NOT possible. Your end result has exactly even paragraphs, and your starting text has different size text text blocks. How are you going to make them all the same size? Take some text out of one paragraph and move it to a different paragraph? In which case, which one?

In any case, again it may be possible but you will need to state clearly exactly what the rules are.