Yes, Samsung Galaxy A50 does have a 3.5 mm headphone jack.
During our test review, we got 145,408 AnTuTu score for Galaxy A50.
Yes, Galaxy A50 does support FM radio.
No. Samsung Galaxy A50 does not have the LED notification light but it does have the Always-on display, so you can get notification alerts by any ways.
Yes, Samsung Galaxy A50 does have fast charging support. It comes with 15W fast charger in the box. It takes about 30 minutes only to charge the mobile from 0% to 30%.