How to use the googletrans.utils.format_json function in googletrans

def get_trans_res (urls: list) -> list:
	res_list = []
	reqs = (grequests.get(u, verify=True, allow_redirects=True, timeout=4, headers=headers) for u in urls)
	res = grequests.map(reqs, size=20)
	for r in res:
		if hasattr(r, 'status_code'):
			if r.status_code == 200:
				try:
					a = format_json(r.text)
					target = ''.join([d[0] if d[0] else '' for d in a[0]])
					source = ''.join([d[1] if d[1] else '' for d in a[0]])
				except Exception as e:
					source = ''
					target = ''
				if len(source) != 0 and len(target) != 0:
					res_list.append(target)
				else:
					res_list.append('')
			else:
				res_list.append('')

	return res_list