RxJava - how to make dynamic api calls & add responses to list

Question

I'm new to RxJava, using RxJava 3 to return a response that contains a dynamic number of urls that I then need to make GET requests to and then add those responses to a list that is to be observed by the ui. Since the number of urls returned is unknown, I'm unsure how to go about this. I tried populating a list with the urls and then looping through them - not the right way to go about it & did not work:

    public void getSection() {
            disposables.add(repository.getContent()
                    .subscribeOn(Schedulers.io())
                    .map(new Function<Content, List<Section>>() {
                        @Override
                        public List<Section> apply(Content content) throws Throwable {
                            return content.getContent().getSections().stream().filter(live -> live.getSectionType().equals("shows")).collect(Collectors.toList());
                        }
                    })
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribeWith(new DisposableObserver<List<Section>>() {
                        @Override 
                        public void onNext(@NonNull List<Section> sections) {
                            contentSourcesURIs = new ArrayList<>();
                            for (int i = 0; i < sections.get(0).getContent().get(0).getContent().size(); i++) {
                                contentSourcesURIs.add(sections.get(0).getContent().get(0).getContent().get(i).getSource().getUri());
                            }
                            sectionList.postValue(sections);
                        }
    
                        @Override
                        public void onError(@NonNull Throwable e) {
                            Log.e(TAG, "getSection: " + e.getMessage());
                        }
    
                        @Override
                        public void onComplete() {
                            System.out.println(Thread.currentThread());
                            for(int i = 0; i < contentSourcesURIs.size(); i++){
                                getVideoContent(Collections.singletonList(contentSourcesURIs.get(i)));
                            }
    
                        }
                    }));
        }

public void getVideoContent(List<String> contentSourcesURIs) {
    for (int i = 0; i < contentSourcesURIs.size(); i++) {
        getVideosContent(contentSourcesURIs.get(i));
    }
}

public void getVideosContent(String contentSourcesURI) {
    String authHeader = URL.POLICY_KEY;
    disposables.add(repository.getVideosPlaylistContent(authHeader, contentSourcesURI)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeWith(new DisposableObserver<Video>() {


                @Override
                public void onNext(@NonNull Video video) {
                    videosList.add(video);
                }

                @Override
                public void onError(@NonNull Throwable e) {
                    Log.e(TAG, "getVideosContent: " + e.getMessage());
                }

                @Override
                public void onComplete() {
                    videoPlaylist.postValue(videosList);
                }
            }));
}

Is it possible to use RxJava to achieve what I'm trying to do? Thanks in advance!