Missing user-facing import/export for historic data (API exists)

[muebau]

Hello,

Before moving to a new system, I usually check the basic import and export functionality to ensure interoperability and make an estimate for the future.
I see that several similar questions have been left unanswered for a long time (#1890, #1701).

Some information on using the REST API was provided in #1202 and #1232.

curl -X POST -H 'Content-Type: application/json' -H 'Authorization: Bearer  [token]' -d '{"date":"2023-01-20","weight":"70"}' http://[host]/api/v2/weightentry/

https://wger.de/api/v2/schema/ui#/weightentry/weightentry_create

What would really help is a simple way for users to import historic data, to make it easier to onboard and export their data for backup, and to avoid the lock-in effect.

My guess is that this could be implemented relatively easily, as the API essentially provides the necessary functionality.