Thanks! pulldata will not work in this case, as it has to be editable on the mobile device. last-saved option is promising, but will require switching from KoBo Collect to ODK Collect. Also, ideally I would like to hide all the questions that can be pulled from the metadata field. So probably (mis)using username might be the best option.
Some tools have implemented a similar approach. E.g. QField (one of the best open source mobile GIS data collection tools) is using user-defined or global variables: https://qfield.org/docs/et/old-doc/user-guide/variables.html?highlight=variable
Would be great to have the same in KoBo!
