What do you mean by validation? Create what type of items? How did you develop your themes?

Dear Sir, after generating the items, I need to send them for expert validation. These items are for a Mentoring Scale for teachers. I conducted interviews and completed a thematic analysis, and now, based on the identified themes, I need to develop the scale items

There are two types of subject matter experts: technical about question and scale construction and second experts about the topic itself. You need to hypothesize a structure and then seek experts in the field. Are there any concurrent measures that can assist you? And would those experts be available as well?

Yes, sir, I will follow these methods. Thank you for your suggestions.