If it is something like enemy coming to gank one of your ally laners then I will use the fall back ping, v key, if you don’t click on a certain champ chat will say something like “Doge2020 warn to be careful” if you click on a champ tho (either at the champ’s location or on their border) it will say in chat something like “Doge2020 warns ____ to fall back”. I use that to warn somebody to move if I see something like the enemy jungler going to gank mid or telling my adc who has low health to play safe or back.
As long as you don’t spam on one person a lot then it won’t count as spamming. Unless there is a lvl 6 Pantheon missing from top, then you spam the hell out of the MIA ping in the middle of top lane and also type “PANTHEON MIA TOP PLAY SAFE” in chat a few times.