Hello Jan Sulc, and welcome to the forums.
The sentence you have quoted is quite ungrammatical.
There is a standard construction, soon-to-be. That person/thing will soon be whatever you write, but isn't yet. For example, when referring to your fiance the week before your wedding, you can say "soon-to-be husband."
I haven't seen that in "hoped-to-be" but I supposed you could do that, as in "Harvard, my hoped-to-be future university" -- but it seems awkward to me.
The meaning that is trying to come through is "the person that he/she hopes will be..."
So I can't give you a gammatical explanation, because it isn't grammatical. If you think it's generally used, could you give a few more examples?