What I am using for the moment to launch applications installed on Chromecast is a grid card:

App launch commands can be taken from here: Android TV Remote - App Links/Deep Linking - Guide
square: false
type: grid
cards:
- type: picture
image: https://upload.wikimedia.org/wikipedia/commons/2/2b/Kodi-side-by-side.svg
tap_action:
action: call-service
service: remote.turn_on
data:
activity: org.xbmc.kodi
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
- type: picture
image: https://upload.wikimedia.org/wikipedia/commons/0/08/Netflix_2015_logo.svg
tap_action:
action: call-service
service: remote.turn_on
data:
activity: https://www.netflix.com/title
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
- type: picture
image: >-
https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Amazon_Prime_Video_logo.svg/450px-Amazon_Prime_Video_logo.svg.png
tap_action:
action: call-service
service: remote.turn_on
data:
activity: https://app.primevideo.com
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
- type: picture
image: >-
https://upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Max_logo.svg/1920px-Max_logo.svg.png
tap_action:
action: call-service
service: remote.turn_on
data:
activity: https://play.max.com
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
- type: picture
image: https://upload.wikimedia.org/wikipedia/commons/8/80/SkyShowtime_Logo.svg
tap_action:
action: call-service
service: remote.turn_on
data:
activity: https://www.skyshowtime.com/deeplink
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
- type: picture
image: https://upload.wikimedia.org/wikipedia/commons/6/64/Disney%2B_2024.svg
tap_action:
action: call-service
service: remote.turn_on
data:
activity: https://www.disneyplus.com
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
- type: picture
image: https://upload.wikimedia.org/wikipedia/commons/b/b8/YouTube_Logo_2017.svg
tap_action:
action: call-service
service: remote.turn_on
data:
activity: vnd.youtube.launch://
target:
entity_id: remote.chromecast_4k
hold_action:
action: none
columns: 7