SSIM value as a script function ?

[Poutnik]

Is possible to get SSIM value as a script function ?
I know SSIM put frame values to CSV file,
but I would like sth like

framesimilarity=SSIMvalue(clip1,clip2)

BTW Do return runtime functions like LuminanceDifference
or Ydifferencefromprevious difference of avg ones, or
avg of differences ? There is no such info in help.

[Wilbert]

BTW Do return runtime functions like LuminanceDifference or Ydifferencefromprevious difference of avg ones, or avg of differences ?
The latter.