fetch Data from a db column to drop down component

what is i have record type not entity

My requirement is to fetch unique values from DB column with the help of record type to populate in dropdown values. I have used this code

a!localVariables(

local!projectManager: a!queryRecordType(
recordType:XYZ Record type,
fields: a!aggregationFields(
groupings: {
a!grouping(
field: XYZ Record type.field,
alias: "projectManager"
)
}
),
pagingInfo: a!pagingInfo(startIndex: 1, batchSize: 5000)
),

a!recordFilterList(
name: "projectManager",
options: a!forEach(
items: local!projectManager.data,
expression: a!recordFilterListOption(
id: fv!index,
name: fv!item.projectManager,
filter: a!queryFilter(
field:  XYZ Record type.field,
operator: "=",
value: fv!item.projectManager
)
)
)
),
)

 But this returns a Facet type object which has many fields and i want to access some specific field which contains unique values