How to send a comment message to my device?

; LightBurn 1.0.06
; GRBL device profile, absolute coords
; Bounds: X37.2 Y20.9 to X123.2 Y85.5
; Image @ 100 mm/sec, 20% power
how can i send these comment messages to my device?

and how can my device know it is in preview state?

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