Getting Data into editable grid

Hi,

I have written the following code where sampleData is a DataStore entity, but I am not getting any data in the front end:

rows: a!forEach( items: ri!sampleData,
expression: a!gridRowLayout(
contents: {
a!textField(
value: ri!sampleData.Account,
saveInto: fv!item.Account,
readOnly: true
),
a!textField(
value: fv!item.jan,
saveInto: fv!item.jan
),
a!textField(
value: fv!item.feb,
saveInto: fv!item.feb
),
a!textField(
value: fv!item.mar,
saveInto: fv!item.mar
)
}
)
),

But when I open the front end I see the following table:

What should I do so that the front end shows the data?

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