Show Group name/user in paging grid column of tempo reports

I want to show Group name/user in my paging grid column in tempo reports , its showing me [Group:##] . Please suggest as when task owner is not there i have to display the group name to which the task has been assigned . I have used togroup(), topeople(), group() functions already on my local variable but togroup() when applied like togroup(local!datasubset.data.taskOwnerAssignees_txt
,"groupName"), it shows me error saying "invalid parameter "group Name"".Below is my code:

a!gridTextColumn(
label: "Task Owner Assignees",
data: local!datasubset.data.taskOwnerAssignees_txt
)

taskOwnerAssignees_txt is of type Group....

OriginalPostID-108833

OriginalPostID-108833

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