Unable to paste commands in chat longer than 256 characters

Was aiming to use a player head in the game, using the command obtained from this generator https://minecraft-heads.com/custom/heads-generator?layout=result

 

It however makes a command that is unable to be used when pasting into Minecraft, with the game reporting "Unclosed quoted string at position 256: "

 /give @p minecraft:player_head{display:{Name:"{{

{\"text\":\"johndrinkwater\"}

}}"},SkullOwner:{Id:"a8ef5342-4a27-4096-826c-574c6b431c33",Properties:{textures:[{{

{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzRlNzRhYzc1MTgwYTQ2MDc2NTRlZGI4M2E1ZTU4Njg4NjM0OGE2YjgxNGM3ZTQ4Y2JhODk1MjE1N2U5M2MzOCJ9fX0="}

}}]} 1}}