Can I use PWM to control a Solenoid Valve through a PLC?

I am looking at controlling the flow-rate of one liquid through a Solenoid Valve in a closed loop system, which takes input from another stream of liquid.

Objective is to mix the two liquids at the right concentration downstream without using a tank and stirrer.

I know there are PWM enabled Solenoid Valves that use their own Controllers, but the price-point is very high and I would prefer to look for an economical solution if possible.

Any guidance will be appreciated. Thanks.