In general?
- The
option 'string' 'some value
' andoption 'boolean' '1
' lines define simple values within the section. Note that there are no syntactical differences between text and boolean options. Per convention, boolean options may have one of the values '0', 'no', 'off', 'false' or 'disabled' to specify a false value or '1' , 'yes', 'on', 'true' or 'enabled' to specify a true value.
~ From: https://openwrt.org/docs/guide-user/base-system/uci#file_syntax
Specifically to OpenVPN config on OpenWrt?
I can't find a reference anywhere thus far - except 1 reference. It's another forum post by @mk24 - from 2017:
It needs to be added to the relevant Wiki(s).