datapack (
    name = "Ticker",
    namespace = "ticker",
    description = "It ticks",
    path = "./",
)

func main @load {
    /scoreboard objectives add SomeCounter dummy "Some Counter"
    /scoreboard players set @a SomeCounter 0
}

func tick @tick {
    /scoreboard players add @a SomeCounter 1

    as @a[SomeCounter=20..] {
        /tellraw @s {"text":"20 ticks has passed"}
        /scoreboard players set @s SomeCounter 0
    }
}

# The above would generate the datapack below

Ticker/
  pack.mcmeta
  data/
    minecraft/
      tags/
        functions/
          load.json
          tick.json
    ticker/
      functions/
        main.mcfunction
        tick.mcfunction
        execute0_ln16.mcfunction

main.mcfunction:
  scoreboard objectives add SomeCounter dummy
  scoreboard players set @a SomeCounter 0

tick.mcfunction
  scoreboard players add @a SomeCounter 1
  execute as @p[scores={SomeCounter=20..}] run function ticker:execute0_ln16

execute0_ln15.mcfunction:
  tellraw @s {"text":"20 ticks has passed"}
  scoreboard players set @s SomeCounter 0

pack.mcmeta:
{
    "pack": {
        "description": "It ticks",
        "pack_format": 1
    }
}

load.json:
{
    values: ["ticker:main"]
}

tick.json:
{
    values: ["ticker:tick"]
}