disable rows in paging grid on condition

hello team,

I have a grid where there is a column status and we need to disable selection for the rows whose status is completed 

using a!foreach() i am able to filter all the status column 

code:-

local!data:status:Completed,clientID:1,productName:Treasury Net,clientName:SAUL BERG,taskCompletedDateTime:,taskUpdatedDateTime:1/13/2020 5:50 PM PST,taskCreatedDateTime:9/10/2019 6:53 AM PDT,createdBy:,owner:vputchal,taskAction:Approve,taskStatus:Approved,wfExecAuditID:1447,taskName:Pre-Operations Perform-Validation Steps,wfFormTaskInstanceID:268460627,wfTaskAuditID:3]; [status:Completed,clientID:1,productName:Treasury Net,clientName:SAUL BERG,taskCompletedDateTime:,taskUpdatedDateTime:1/13/2020 5:50 PM PST,taskCreatedDateTime:9/10/2019 7:07 AM PDT,createdBy:,owner:vputchal,taskAction:Approve,taskStatus:Approved,wfExecAuditID:1448,taskName:Pre-Operations Perform-Validation Steps,wfFormTaskInstanceID:268460768,wfTaskAuditID:4]; [status:Completed,clientID:1,productName:Treasury Net,clientName:SAUL BERG,taskCompletedDateTime:,taskUpdatedDateTime:1/13/2020 5:50 PM PST,taskCreatedDateTime:9/10/2019 7:07 AM PDT,createdBy:,owner:vputchal,taskAction:Approve,taskStatus:Approved,wfExecAuditID:1448,taskName:Pre-Operations Perform-Validation Steps,wfFormTaskInstanceID:268460768,wfTaskAuditID:5]; [status:Completed,clientID:1,productName:Treasury Net,clientName:SAUL BERG,taskCompletedDateTime:,taskUpdatedDateTime:1/13/2020 5:50 PM PST,taskCreatedDateTime:9/10/2019 7:07 AM PDT,createdBy:,owner:vputchal,taskAction:Approve,taskStatus:Approved,wfExecAuditID:1448,taskName:Pre-Operations Perform-Validation Steps,wfFormTaskInstanceID:268460768,wfTaskAuditID:6]; [status:In Progress,clientID:1,productName:Treasury Net,clientName:SAUL BERG,taskCompletedDateTime:,taskUpdatedDateTime:1/13/2020 5:50 PM PST,taskCreatedDateTime:9/10/2019 6:53 AM PDT,createdBy:,owner:vputchal,taskAction:Approve,taskStatus:Approved,wfExecAuditID:1447,taskName:Pre-Operations Perform-Validation Steps,wfFormTaskInstanceID:268460627,wfTaskAuditID:2]

a!forEach(
items: index(
index(
local!data,
"data",
{}
),
"status",
{}
)

from above code I am able to find  (Completed; Completed; Completed; Completed; In Progress)

now in disable parameter i have written 

disabled : a!forEach(
items: index(
index(
local!data,
"data",
{}
),
"status",
{}
),
expression: if(
fv!item[fv!index] = "Completed",
false,
true
)
),

but it is disabling all the rows and not just completed once 

screenshot attached