Not "I am doing this on your behalf" but "I am being asked to do this because it might help."
You can't wear a safety pin or a bracelet and say "I am a safe person." It doesn't work that way. You can't put hashtag-protect-trans-kids in your bio and expect it to matter or to even tell me anything particularly positive about your character (it tells me you know the words, not that you believe them).
But you absolutely can wear a safety pin to communicate, say, membership in the punk scene.