Do you know what a Wheatstone Bridge is? In this diagram, R2 represents a sensor of some kind that changes resistance in response to whatever it is meant to measure. The amount of change is often only a tiny fraction of the total resistance and may be difficult to measure. So a second voltage divider is set up and the difference in voltage between the two voltage dividers is measured, thereby subtracting the offset created by the total resistance.
A differential aka instrumentation Op Amp is connected in place of the voltmeter. In this way, the DC offset is removed.
What you have there is known as a half-bridge, it has two identical strain gauges inside. Typically, they are connected internally one of two ways:
One gauge is compressed while the other is stretched when weight is applied.
One gauge is unstressed and the other is stretched when weight is applied.
The reason for two identical gauges is to compensate for resistance changes due to temperature.
So you need to add two resistors to make another voltage divider. Preferably with a trimpot in between to adjust the voltage to match the voltage from the load cell when it is at 0kg stress.
You don't need 0.1% resistors or low thermal drift resistors. They should just be the same kind of resistor, equal value, with a much lower value trimpot between them, with the wiper of the trimpot going back to the instrumentation Op Amp.
I prefer not to make one resistor variable, as then its temperature drift won't match the resistor. With the trimpot, the resistors will swamp any changes in the trimpot, and both halves of the trimpot will match the temperature drift of the other half.