Unfortunately this is impossible. Mueller has no limits on what he can investigate and he will eventually find something like an unpaid parking ticket.
Then he will make a big deal out of an obstruction of justice conspiracy centered on the President.
Yes, it IS impossible.
Besides being the Commander in Chief of the US Armed Forces, he is ALSO the Chief Law Enforcement Officer of the United States. As such, he can’t be legally charged for carrying out his constitutionally proscribed duties, which is PRECISELY what he was doing (at the behest of Obama) prior to his inauguration.
Now, politically....that’s another story.