How do I stream an outer and inner (nested) hashmap in java/springboot to be able to equate the values in the map to values in an actual class?

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Java

springboot

I have this class

public class InsurancePackageCovers  {
    ProgramRef programId;
    PackageRef id;
    Set<InsuranceCover> covers;

    InsurancePackageCovers(ProgramRef programId ,PackageRef id,Set<InsuranceCover> covers) {
        this.programId = programId;
        this.id=id;
        this.covers = covers;
    }

and this map

Map<ProgramRef,Map<PackageRef, Set<InsuranceCover>>>allProgramPackages

I would like to stream the map to resemble something like

Map<ProgramRef,Map<PackageRef, Set<InsuranceCover>>>allProgramPackages = this.packageCoverRepository.getInsurancePackageCoversByProgramIds(programsToValidate)
               .stream()
               .collect(Collectors.toMap(
                       InsurancePackageCovers::getProgramId,
                               entrySet()
                               .stream()
                               .collect(
                                       Collectors.toMap(
                                               InsurancePackageCovers::getId,
                                               InsurancePackageCovers::getCovers
                                       )
                               )
               );

where

programref is rep by InsurancePackageCovers::getProgramId,  PackageRef by InsurancePackageCovers::getId and Set<InsuranceCover> by  InsurancePackageCovers::getCovers

What I have tried:

New to nested maps so basically stuck.