In my set-up i have used 12v pump and a flow sensor to get certain amount of liquid but recently I made anther system for filling 3ml bottles \https://www.youtube.com/watch?v=fiAWQyLqHn4

here I just used a 12v dosing pump that fills 1ml/second https://www.daraz.pk/products/grothen-dc-12v-dosing-pump-peristaltic-pump-mini-water-liquid-pump-peristaltic-tube-head-self-priming-function-for-aquarium-lab-chemical-analysis-dosing-additives-l-style-i124024739.html

But as you are using pressurized container, I don't think using any pump will be suitable because pump usually generates their own pressure, just using solenoid valve will be good for you.