How to handle string with dash (-) in TypeScript?

I have an asynchronous function call in Angular which is like this-

fetchStandingInstructions() {
    this.standingInstructionService.fetchSpecialInstructions().subscribe(
        data => {
            this.instructions = data._embedded.standing-instruction;
        }
    )
}

Then this error occurs:

Type 'number' is not assignable to type 'StandingInstruction[]'

Because standing-instruction is considered as standing (minus) instruction.

How to handle this in the client side?