How to set value in 2 way binding in angular with a function

I have a problem that how can I set a value in 2 way binding with a function.

the code looks like that:

<app-charge-station-modification-sort-order
[(canAddMore)]="setCanAddMoreSortOrder(eForm.controls.sO.value)"
[index]="index"
[formGroup]="form"
[selectedValues]="sOValues"
controlName="sO"
></app-charge-station-modification-sort-order>


and ts file:

public setCanAddMoreSO(sO: number):boolean{
return isNaN(sortOrder) ? false : true;
}


but I got this error:

Unhandled Promise rejection: Errors during JIT compilation of template for xxx

Error: Unexpected token '='
​

any solutions??

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