Timer - slot for text (TMP text) is missing

2D - What am I missing when the Timer game object does not have a slot to add/attach the TextMesh Pro text in Inspector? There is a slot to add scripts, but not the text. TMP essentials were downloaded and installed in the project.
Not sure if related - the script (off net) has [SerializeField] but I get an error that it is not found. If I remove the SerializeField, it compiles. Regardless, I can attach the script but not the text to the Timer.

If youre not using public TextMeshProUGUI try using it, it might help