No. Nokia 7 Plus does not have the Dolby audio.
Yes, Nokia 7 Plus does have the OTG support.
Nokia 7 Plus has an ambient light sensor, proximity sensor, accelerometer, e-compass, gyroscope, fingerprint sensor and hall sensor.
Yes, Nokia 7 Plus does have the headphone jack, which is located on the top panel of the phone.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.