More Motion Flags

I was trying to recreate the mod: "Flower Trail" from "Microsoft MakeCode for Minecraft" as a datapack. I found out there was no flag for when the entity is walking. Currently, the only motion flags are: ["is_sneaking", "is_sprinting", "is_swimming"]. There should be more motion flags like: ["is_walking", "is_jumping"]. For an example:

{
  "condition": "minecraft:entity_properties",
  "entity": "this",
  "predicate": {
    "type": "minecraft:player",
    "flags": {
      "is_walking": true
    }
  }
}