TTS audio output for HA with docker and linux?

Configuration
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I’m very confused on how to obtain an audio output on my HA.
I’m have already readed a lot of thread on RPi and MOPIDY but I’m stuck in trouble.
I’m running a docker image under linux (xubuntu 18.04), this is my hardware:

* serial:
  * /dev/ttyS11
  * /dev/ttyS6
  * /dev/ttyS26
  * /dev/ttyS31
  * /dev/ttyS29
  * /dev/ttyS23
  * /dev/ttyS21
  * /dev/ttyS0
  * /dev/ttyS10
  * /dev/ttyS19
  * /dev/ttyS24
  * /dev/ttyS5
  * /dev/ttyS22
  * /dev/ttyS13
  * /dev/ttyS18
  * /dev/ttyS1
  * /dev/ttyS20
  * /dev/ttyS25
  * /dev/ttyS9
  * /dev/ttyS8
  * /dev/ttyS4
  * /dev/ttyS14
  * /dev/ttyS16
  * /dev/ttyS30
  * /dev/ttyS7
  * /dev/ttyS15
  * /dev/ttyS2
  * /dev/ttyS28
  * /dev/ttyS27
  * /dev/ttyS12
  * /dev/ttyS17
  * /dev/ttyS3
* input:
  * C-Media USB Headphone Set
  * HDA NVidia Line Out Front
  * HDA NVidia Line
  * HDA NVidia Mic
  * HDA NVidia Line Out Surround
  * HDA NVidia Line Out CLFE
  * Power Button
* disk:
* gpio:
* audio:
  * 0:
    * name: HDA-Intel - HDA NVidia
    * type: NVidia
    * devices:
      * [object Object]
      * [object Object]
      * [object Object]
      * [object Object]
      * [object Object]
      * [object Object]
      * [object Object]
  * 1:
    * name: USB-Audio - C-Media USB Headphone Set
    * type: Set
    * devices:
      * [object Object]
      * [object Object]