Need to join the input array of objects to string

the sample input.

"chathist": [{
		"created_by": "Test",
		"text": "Account",
		"content": "",
		"content_type": "Question"
	}, {
		"created_by": "USer1",
		"text": "Clicca sulla ttger alla wrtr rtwt l'rewrre er deve ererg la :<b><br><br><ul><li><a role=\"button\" tabindex=\"0\" class=\"mccs-input\">ffdgc!</a>",
		"content": "",
		"content_type": "text"
	}, {
		"created_by": "User1",
		"text": "Management ",
		"content": "",
		"content_type": "Question"
	}, {
		"created_by": "Test",
		"text": "Quale resettare?<b><br><br><ul><li><a role=\"button\" ",
		"content": "",
		"content_type": "text"
	}, {
		"created_by": "User1",
		"text": "Reset  Xchanging",
		"content": "",
		"content_type": "Question"
	}, {
		"created_by": "User1",
		"content_type": "Mps",
		"content": {
			"intent": "changing",
			"video_URL": null,
			"solution_URL": "",
			"title": "Reset changing",
			"text": "Scriva una e-mail a<strong> xch-helpdesk@xchanging.it</strong><span style=\"color: black;\">oppure si  sul desktop l'icona </span>"
		}
	}]

the example sample output.

VA history:
User1: IBM Demo: What is LUCA
VA: What is MNCQ Answer: MNCQ stands for dafsasf. 
User1: Marked the solution NOT helpful. Comment: needs additional detail
VA: Feedback recorded
VA: feedback to improve. view the other.
User1: window login
VA: Please click for your query. If you do not wish ask any other question.