How to do per leg altitude?

I read some topics here and there that this is a complex function to implement, hence it is not supported. I am wondering how others do this?

My workaround is to create it in Skydemon first:

And after that add the altitudes into the Remarks column so I can follow it.

For a long flight it might be a bit of a work. I tried to export from Skydemon and import into LNM but did not work.

So how everyone is doing this?