Low Power : Power Shutoff for Memories through UPF Power Intent

How to shut off a memory(ASIC) which is in OFF power domain? (Constraints in design: Unable to power off a memory as it is always powered up and cannot add a power switch cell for a memory supply voltage)
Is there a methodology to shut off a memory separately in UPF?
|-----------------------------------------------|
| ---------------------PD1---------------------|
|-----------------------------------------------|
|-----------------------------------------------|
|----|-------------------------|-----------------|
|----|---------PD2-----------|-----------------|
|----|----- |---------|--------|-----------------|
|----|------|Memory|--------|-----------------|
|----|------|---------|--------|-----------------|
|----|------------------------|-----------------|
|----|------------------------|-----------------|
|-----------------------------------------------|

How can you shutoff something using UPF if the physical capability of shutting off is not there? Am I reading this right? Why would you go through the trouble of specifying this behavior if the actual chip won't behave like this?