If IV/IO access is not obtained yet and epinephrine is indicated, endotracheal administration may be used. IV/IO is preferred though and will usually be repeated once vascular access is obtained. Possibly out of scope so I think a quick note in Extra is sufficient. AMBOSS mentions this method but isn't highlighted.
https://cpr.heart.org/en/resuscitation-science/cpr-and-ecc-guidelines/neonatal-resuscitation agrees. "While vascular access is being obtained, it may be reasonable to administer endotracheal epinephrine at a larger dose (0.05 to 0.1 mg/kg)...If endotracheal epinephrine is given before vascular access is available and response is inadequate, it may be reasonable to give an intravascular* dose as soon as access is obtained, regardless of the interval."
Source: AMBOSS - https://next.amboss.com/us/article/Uu0bq3#Y6ca481dbe44a1bbef0040e743a98f04d