Hi Sonam,
Cell and block are independent and have their own data.
We can set the relative position of a cell with respect of a block; however, as far as I am aware, there is such no option to set the height of a cell dynamically depending on height of another block.
The height and size of cell will get affected only by the data residing in it.
You may try to share the screenshot of your report so that we could try for some workaround.
Regards,
Yuvraj