There is a method in a factory newResource.
The third parameter of this method is id. Are there any ways or workarounds to generate id?
There was a similar question if you mean to auto-increment the identifier: Auto Increment field in Composer
It is not recommended by the devs, because different peers may have calculated the IDs at the same time for different new assets/participants and disagree. Disagreements would force all records to roll back.