How do I convert a string, and use a string as a property?

I have an array in the following format:
{ownsCar: 'true', ownsBike: 'true', ownsHouse: 'true'}
{ownsCar: 'false', ownsBike: 'true', ownsHouse: 'true'}
{ownsCar: 'true', ownsBike: 'false', ownsHouse: 'true'}
etc ............
And I need to test against each item e.g.
if...
myDataGrid[myItem].ownsCar == Object(myCheckbox).label
... then
if...
myDataGrid[myItem].ownsBike == Object(myCheckbox).label
... then
if...
myDataGrid[myItem].ownsHouse == Object(myCheckbox).label
... then
But I need to build my application where the property (e.g. "ownsCar", "ownsBike", "ownsHouse") is a variable such as:
if...
myDataGrid[myItem].myProperty == Object(myCheckbox).label
... then
I would like to loop through my Array, counting the number of items, and then use each item as a property.
How would I convert the string (e.g. "ownsCar") into a property "myProperty" ???
Many thanks in advance
Chris

Thanks, but my problem is that I won't know what my property will be.
E.g. they could be...
{svnsdkvnsdklvnsdklv: 'true', seuAfnwfnw: 'true', asfwseionf: 'true', etc.................}
and there could be lots of them.
I need to have myObject[N], where N is a variable property for each of the items taken from a variable length array
so...
ownsCar is represented by myObject.[N]
ownsHouse is represented by myObject.[N+1]
ownsBike is represented by myObject.[N+2]
etc
(sorry, this is so difficult to explain when I dont know what the answer is)

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NVARCHAR = DT_WSTR
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