Add Value_Template - Modify the value with Jinja templating

[GuyKh]

Is your feature request related to a problem? Please describe.
Using Authenticated for printing out last IP login.
One of the fields I use is date - and I get this:

Describe the solution you'd like
I'd really love to have the option to format the printed value.
e.g.

  - attribute: last_authenticated_time
    entity: sensor.last_successful_authentication
    prefix: '<b style=''font-weigth: bold; color: orange''>At: </b>'
    style:
      left: 5px
      top: 30%
      transform: none
     value_template: "{{ as_timestamp([value]) | timestamp_custom('%D %-I:%M %P') }}"     # <--- new part
    type: 'custom:state-attribute-element'

Describe alternatives you've considered
The other option I have is to create a template sensor, but that is much less dynamic and less flexible

Additional context