Is this possible that we export the Unity Diagnostic viewer log in to .txt format
Unity diagnostics viewer gives you an option of archieving the diagnostics logs in the local disk, which later can be used. You get this option by right clicking in diagnostics viewer and DiagViewer Properties. There you ll find the option of Archiving. See below its description..
Click to generate an archive. The entry field and the Browse button allow you to define the path of the archive file.
Cyclic archiving: a new archive file is generated every 1000 saves.
Periodic archiving: a new archive file is generated every x hours.
Hour allows you to define the number x (between 1 and 24).
Additional information field: allows you to store additional data in the file.