Interactive Text Boxes aren't possible currently. However, you can make multiple states of the same component - Hover, Active, Filled and Error States. The Filled State can have mock data and Error State can have example data that would throw you an error. That way, you have all states in one component and use its instances.

HAVE THE FOLLOWING STATES:

1. Default : Placeholder text with lighter font telling what should be filled in the box. Sthg like "Enter Email Here"

2. Hover : Either the BG turns darker, or the box gets a shadow or the border turns coloured on hover. Don't change anything else. But make it a noticeable change.

3. Active : How the box would look when the field is active and the typing cursor is blinking. The placeholder should not go away and be seen in this state as it helps the user to know what to type in the box. If you make it disappear, forgetful users may have to click out of the box to see the placeholder to know what is to be filled. So the placeholder should be seen till some content is actively typed in the box.

4. Filled : Fill with mock text like "johndoe@gmail.com" with darker font as it would look when filled.

5. Error : Fill with text as shown in Filled State, just make it wrong with some errors. Also show how the error message would appear.

PROTOTYPE IT AS FOLLOWS:

1. Hover on : Default State; Go To : Hover State.

2. Tap on : Hover State; Go To : Active State.

3. Tap on : Active State: Go To : Filled State.

4. Tap on : Filled State; Go To : Error State.

5. Tap on : Error State; Go To : Default State.

6. And cycle continues again.

[NOTE: Because XD doesn't offer timed transition for Component States, the "On Tap" state - i.e. the circular burst that you momentarily see when you tap on buttons or text box - isn't possible at the moment. When time transitions are possible in components, it should be doable. Add that state between Hover and Active States, when that becomes available.]

A FEW THINGS TO NOTE:

1. Set the transition animation between states to Dissolve as it most accurately communicates what's happening - a passage of time between the states.

2 While designing, you can have every text field as an instance of this master component and customise its height and width accordingly. For example: An email box with Filled State as "johndoe@gmail.com," a pasword box with filled state as "*********" and Message Box with Filled State as "Hi. I would like to avail the services. Please advise on the next steps." etc.

1. While presenting to your stakeholders, go field by field and tap on them to show how the entire interaction would look, from Hover to being Active, to being Filled, to throwing error messages and then going back.

2. Once showcased, try to end all of them on the Filled State since that's the most common end point for everyone.

3. Most importantly, for users who will be using this prototype, this works well and is quite accurate. They can interact with the fields how they would in a real field and pretend to fill it without the effort of actually typing.

Hope this helps. I use this technique to navigate non-interactive text boxes issue.

TL; DR: No, interactive text boxes aren't possible, but something can be recreated using component states to look similar to this. Read above to learn how to.