You will get differing opinions depending on the CPO or above you consult. The consensus has been to include items not captured in OMPF field codes 30-38 and call-out items that may be visible on OMPF (SOY NAM, FLOC, JOint/Other Awards, etc.). Just know everything you add must be reviewed and briefed by the person who gets your file.
These two vids give a rough breakdown of the briefing scenario:
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.youtube.com/watch%3Fv%3DxMTzkPshhNw&ved=2ahUKEwik-ZyJgI6GAxVeNlkFHZ2lCfwQtwJ6BAgQEAI&usg=AOvVaw0aN8VEEePIYP3zjlHLJl8F
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.youtube.com/watch%3Fv%3DPlHtztMpnJQ&ved=2ahUKEwik-ZyJgI6GAxVeNlkFHZ2lCfwQtwJ6BAgSEAI&usg=AOvVaw2WX_A7OF-BJjYwhRUaLl9j
In my opinion, if you think it speaks to meeting or exceeding the eligibility framework on your enlisted career path (ECP/LADR) and you want it to stand out, add it to your package/LTB. Keep your enclosures to the lowest number possible while reaching your goal.
You are your greatest advocate!!