まず、コマンドで

tag @r add emerald

clear @a[tag=emerald] emerald 0 1

/scoreboard players add @a[tag=emerald,hasitem={item=emerald}] money 1

tag @a remove emerald

execute as @a run titleraw @s actionbar {"rawtext":[{"text":"§l所持金 : §e"},{"score":{"name":"@s","objective":"money"}}]}

​これでできます！