Echo steps is the only way to comment steps in a journey. It would be easier to read what at test is doing if the echo steps is formated in boldface in the trainer and outside the trainer (read mode).
You can mark echo steps as headings by starting your message with a hash tag(s) as shown below. Release notes.
"#" = Header level 1 - most important heading level.
"##" = Header level 2.
"###" = Header level 3 - least important heading level.
Hope this helps and thank you all for thee feedback!