UserTech - updating LIST elements with ShowVar?

Is there a way to refresh LIST items using SHOWVAR? The goal is to create some custom inline forms and allow user-friendly tool and base selection. List should show names instead of numbers - even if names have been changed.

DECL PARAM ToolList = {VALUE {LIST : ... }}

SHOWVAR(FULLPATH[] "TOOL_NAME[,]", PARAM ToolList )
;or individually..?
SHOWVAR(FULLPATH[] "TOOL_NAME[3,]", PARAM ToolList[3] )
SHOWVAR(FULLPATH[] "TOOL_NAME[3,]", PARAM ToolList.Item[3] )
SHOWVAR(FULLPATH[] "TOOL_NAME[3,]", PARAM ToolList.Item[3].Value )
SHOWVAR(FULLPATH[] "TOOL_NAME[3,]", PARAM ToolList.Item[3].Value[] )

btw. the first one does not show any errors but it also does not modify list elements.

so far attempts to modify individual elements resulted in error message 'object not found'

reading individual tool name (or all at once) is not a problem, but have not found yet how to get them into a parameter list