How to get webos system volume size?

i have check webos developer api doc . just have audio set muted && volume down/ up. can not see the current volume size. So i there have any api can get the system volume size ? thx alot .
Audio down/up/setmuted api link : Audio API Reference Guide | webOS TV Developer

Currently, no API is provided to get the current volume value. If there are any updates, we will let you know via our website. Thank you.

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