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Define rectangle light distribution according to length

I want the following unique rectangle light.

Size : 20cm × 5cm
Intensity is changed according to range
500cd (range : from Center to 10cm × 2.5cm rect)
250cd (range: from 10cm × 2.5cm range to 20cm × 5cm)

At first, in my idea ,it can be achieved by IES profile.
But IES profile defines a point light distribution not area light (multiple lights) distribution.

So how to define rectangle light distribution according to lenght of light ?

This seems to be similar question.

I and he (who posts above question) want a Light that distribute linear lights.
We’re looking for not rectLight based on point light…

I hope Epic add the above function…