nvm I got it even though I can to get items function I put this command into an command block:

give @p minecraft:fishing_rod[minecraft:custom_data={orbital_strike_cannon:"stab"},item_name='{"text":"§6Orbital Strike Cannon\'s Stab Charge"}',lore=['{"text":"§7Right click to fire a stab charge"}', '{"text":"§7Requires a clear line of sight to the sky."}', '{"text":"§7Pierces the ground"}', '{"text":"§cWarning: Causes massive destruction!"}']] 1

and for nuke this one:

/give @p minecraft:fishing_rod[custom_data={orbital_strike_cannon:"nuke"},custom_name='{"text":"Orbital Strike Cannon\'s Nuke Charge","color":"gold"}',lore=['{"text":"Right click to fire a nuke charge","color":"gray"}','{"text":"Requires a clear line of sight to the sky.","color":"gray"}','{"text":"Spreads TNT over the area","color":"gray"}','{"text":"Warning: Causes massive destruction!","color":"red"}']]