This is an easy text mode switch to get name instead of ID. Go to the text mode of the grouping and where it says homeTeamID, you're changing it to homeTeam:name. Like this:
textmode=true
group.0.linkedname=assignedTo
group.0.namekey=view.relatedcolumn
group.0.valuefield=assignedTo:homeTeam:name
group.0.namekeyargkey.0=assignedTo
group.0.namekeyargkey.1=homeTeam:name
group.0.valueformat=string
If this helped you, please mark correct to help others : )