Is there a standard design language for mockups

Hi I'm new in UI/UX world. My question is when creating mockups for desktop/mobile applications, is there a kind of standardized symbol that you guys use communicate with developers for fluid designs?

Sometimes you want the developers to make do fluid design otherwise they will just grab the exact width number from zepplin, for example

How do you represent some layout similar to css flex box, is there some standardize symbol/lines that we can use to translate "there are 3 columns, the first and second are fixed width, and third will fill reminding."

or something like: "take whole row, and put the 3 children in a space-around distribution"

In Android studio there are some kind of those symbols

As you can see, they use a spring as fluid spacing and solid line as fixed space. but I don't know if there is a formal one.

Thanks