how to switch between charge modes in Lenovo ideapad c340-14IWL

i have Lenovo ideapad c340-14IWL and Ubuntu 20.04 installed. How to switch between charge modes.

fast charge | normal | conservation mode (<60%)

for Windows we have "lenovo vantage". on Ubuntu I could only find how to switch between normal and conservation mode.

turn conservation mode mode on:

echo -n "1" | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode > /dev/null

to turn off use same command but replace "1" to "0":

echo -n "0" | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode > /dev/null

or manually edit file .../conservation_mode

in this folder (...VPC2004:00/) i found "F toggle" file contains "0" or "1". changing it can toggle function F keys (F1-F12). but can't find any fast-charge settings

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