Any supervising agency or person having a child in foster care or institutional care and wishing to recommend to the secretary support of the adoption of such child as provided for in RCW 26.33.320 and 74.13A.005 through 74.13A.080 may do so, and may include in its or his or her recommendation advice as to the appropriate level of support and any other information likely to assist the secretary in carrying out the functions vested in the secretary by RCW 26.33.320 and 74.13A.005 through 74.13A.080. Such agency may, but is not required to, be retained by the secretary to make the required preplacement study of the prospective adoptive parent or parents.