Iron-dependent dioxygenase that catalyzes the conversion of 4-hydroxyphenylpyruvate (4-HPPA) to 4-hydroxymandelate (4-HMA) in the mitochondria, one of the steps in the biosynthesis of coenzyme Q10 from tyrosine. . This is the function of ENSG00000186603 (HPDL, 4-hydroxyphenylpyruvate dioxygenase like).