Assign a key to play a tag named "TagName"

Trigger Tag.lua

local spr = app.activeSprite
if not spr then return end

for _,t in ipairs(spr.tags) do
  if t.name == "TagName" then
    local old_play_once = app.preferences.editor.play_once
    local old_play_all = app.preferences.editor.play_all

    app.activeFrame = t.fromFrame
    app.preferences.editor.play_once = true
    app.preferences.editor.play_all = false

    app.command.PlayAnimation()

    app.preferences.editor.play_once = old_play_once
    app.preferences.editor.play_all = old_play_all
    break
  end
end