HTML in Appointments+ Shortcode options

The default shortcode of [app_monthly_schedule] outputs an H3 as part of the title. However when I attempt to override the title with some HTML in it, such as:

[app_monthly_schedule title="<h3>Available times for START</h3>"]

It outputs the HTML tags as part of the text and not as actual tags. How can I use HTML in the title option and have it output tags correctly?