How to convert my cypress code into generic Type script parameterized function

As I am new to this UI automation/cypress world, need help to setting up the assertion on javascript object return by cypress-ag-grid package

My code is reading ag-grid data

cy.get("#myGrid").getAgGridData().should((data)=>{
cy.log(data)
})

Which is printing below object in console

[
{ id: 1, name: "tata", saftyRating: "50" },
{ id: 2, name: "maruti", saftyRating: "50" },
{ id: 3, name: "ford", saftyRating: "45" }
]

My cypress code is:

cy.get("#myGrid").getAgGridData().should((data)=>{
  data.forEach(({ saftyRating }) => {
    cy.wrap(+saftyRating).should('be.gt', 50);
  })
});

This is working fine till the moment I try make it generic parameterized typescript function which is as below:

columnValueAssertion(colname:string, asserttype:string,value:number){
cy.get("#myGrid").getAgGridData().should((data)=>{
      data.forEach(({ colname }) => {
        cy.wrap(+colname).should(asserttype, value);
      })
    });
}

And calling it as:

columnValueAssertion('saftyRating',"be.eq",50)

It is throwing assert error:

-assert NaN is not equal to **50**

And when I am replacing the colname by saftyRating it is working fine Not sure how convert this to parameterized function

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