Hello and welcome to OpenStreetMap Hirrumi :)
thank you for helping keeping The Map up to date.

You have asked for someone to review your changeset. I'll offer some feedback here:

It's totally fine to just add the grassland area. If it doesn't have a name please do not add a name. If you feel you need to leave a note to other mappers or the world you can do so with the note or description tags.

Our wiki has some more details for you
https://wiki.openstreetmap.org/wiki/Names
https://wiki.openstreetmap.org/wiki/How_to_map_a

in case of questions don't hesitate to reach out

happy mapping
silversurfer83
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            Published using OSMCha: https://osmcha.org/changesets/148140942
            