No, unfortunately. Merely having a job offer does not meet the requirements of having a "valid job offer" as defined by IRCC.
http://www.cic.gc.ca/english/immigrate/skilled/offer.asp
To be eligible while on an open work permit, your employer would have to obtain a positive LMIA to support your application.
I am currently on a spouse open work permit. Can I apply for independent open work permit o the basis of the new job offer ? If yes, I think I can get 50 marks
The definition of "valid job offer" is independent of the class for which you expect to apply. But in fact, to meet the definition of a valid job offer, most people will be eligible under CEC.
This does not change the fact that the OP is not eligible. Please feel free to read the information at the link I provided.