Any way to extend the timeout on individual HTTP requests?

We've built an admin page/widget which uses ajax calls to a helper 'attachment' within the widget itself which does the work.. we call it like this in the front-end JS;

## Simplified code for ease of reading
jQuery.telligent.evolution.post({
	url: '$core_v2_encoding.JavascriptEncode($core_v2_widget.GetExecutedFileUrl('changeGroupPerms.vm'))',
	data: { sourceGroupId: data.sourceGroupId, groupId: data.groupId }
})
.then(function(response) {
	console.info(response.message);
	if (!response.success) window.failedCount++;
	resolve();
});

The chageGroupPerms.vm attachment in the widget takes a while to complete, especially if the group we're changing has a lot of sub-groups.. sometimes it'll take over 2 minutes, at which point the chageGroupPerms.vm returns a 500 error.

It's literally a few seconds off completing (I added logging to find out how far through it is)

Is there any way to increase this timeout for this request since I know it'll take a bit longer than usual?

FYI, we're hosting this in Azure as an app service (so we're not running IIS as such).

Thanks!