Praise be to Allah.
It is not permissible to say this, because it is like objecting to Allaah, may He be exalted. He knows best about the situation of His slaves, and He is Most Wise in what He decrees for them of health and sickness, richness and poverty, and so on.
What is prescribed is to say, “May Allaah grant him good health and heal him,” and similar good phrases.
May Allaah help all the Muslims to understand their religion and adhere to it steadfastly, for He is the Best to be asked.