Collect streamed data into an angular app

Assuming that I have a Flask backend streaming data bit by bit, following something like:

from flask import Flask, Response, jsonify
from flask_cors import CORS
import json

from itertools import cycle
from time import sleep


app = Flask(__name__)
CORS( app)

@app.route('/')
def hello_world():
    def gen():
        for i in cycle(range(1,10)):
            yield json.dumps( {"new_val":i})
            sleep(1)
    return Response( gen())


app.run( port=5000, debug=True)

How can I collect this data in something like an Observable on an Angular 5-6-7 app? I have tried playing with httpClientModule and done some research but I did not find any working example.

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