The calculation you are interested with is the percentage of blood pumped with each heartbeat. Normal is 50 to 70% (EF...ejection fraction), and a lower than normal ejection fraction almost always indicates there may heart wall movement impairment that weakens the heart's contractility.
The problem frequently is the result of a prior heart attack that has damaged heart cells, or the cause can be hypoxia (low oxygen level in heart cells) caused by anemia, respiratory issues, abnormal heart structure, etc.
If there is a connection with heart and liver issue it would be that the retension of fluids by liver disorder increases the heart's workload as excessive fluid retension increase the blood volume and the heart works harder with additional burden. The additional burden can cause the heart to enlarge and the enlarged heart can/will reduce the EF.
Hope this provides an insight and helps you, and thanks for sharing and if you have any further questions or comments you are welcome to respond. Take care.