You can create those files using sudo with your editor of choice: sudo vim /etc/NetworkManager/conf.d/00-macrandomize.conf, sudo nano /etc/NetworkManager/conf.d/00-macrandomize.conf , etc. /etc is not one of the read-only paths on Silverblue so you should be able to edit it just like in Workstation this way.
I don’t know about that part.
How graphical interface handles the randomization of mac ids and generate but it works afaik and in gnome it is waiting feature to be default while connecting to wifi with randomized mac-id you can look into the git for more indepth info
and to use it turn wifi off and on again.
Nonetheless I have shown you maybe the easiest way to configure mac-id randomization. and it does not require any editing of system .conf file with sudo and it works just like android.
it is not preferred to touch system conf file as many things can go wrong if not made correctly.
it can be done on other distros and hopefully on kde too.
Please work on improving your posts.
One long paragraph with no capitalization, little punctuation, and things run together make it very difficult to read and follow the info.
I realize english may not be your native language, but if you work on it all of us will benefit by being better able to read your posts and you will benefit by being better able to express your thoughts in an understandable manner.
Thank you for your efforts to assist here. It is very useful.
I would suggest that for the post above it should read something like this.
Note that breaking the subjects into paragraphs and using capitalization and punctuation improves the readability.