I have a paper under review (Second round) after a minor revision. The journal has limited page length and I contacted the editor to ask whether I can add additional pages but he said that it is only possible after acceptance. One information which I thought less important seems very crucial, where other researchers asked me about it after a presentation of my research. In addition, the lack of this information in the implementation will completely deviate the experimental results.
I am wondering how I can add it after the acceptance of the paper. Should I inform the editor for another review round?