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by (240 points)
Technically possible from server scripts using live connect ,however it is tedious.From the services use HTTP connector to make server side REST API calls(available from SYSDATA toolkit).

--Mahesh
by (8.1k points)
you can make rest api calls from coach views also as xhr requests e.g. the following in the load section will retrieve the user profile image via rest api call

var _this = this;
var imagehtml;
var imgheight = 60;
var imgwidth = 60;
var userName = "current";

if (this.context.binding){
userName = this.context.binding.get("value");
}
if (this.context.options.imageHeight){
imgheight = this.context.options.imageHeight.get("value");
}
if(this.context.options.imageWidth){
imgwidth = this.context.options.imageWidth.get("value");
}

var xhrArgs = function(config) { return {
url: "/rest/bpm/wle/v1/avatar/" + userName, content: {
accept: "application/json"
},
load: displayImage,
handleAs: "json"} };

try{

deferred = dojo.xhrGet(xhrArgs ( { inputs: {}}));

} catch (error) {
alert(error);
}

function displayImage(json_results) {
imagehtml = "<img height='" + imgheight + "' width='" + imgwidth + "' src='data:image/jpeg;base64," + json_results.data.userAvatarImage + "' />";
var imgDiv = _this.context.element.getElementsByTagName("div")[0];
var nameDiv = _this.context.element.getElementsByTagName("div")[1];

imgDiv.innerHTML = imagehtml;
nameDiv.innerHTML = json_results.data.userName;
}

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