FINALYYYYY, GOT IT RUNNING.
CONFIGURATION.YAML:
shell_command:
wallbox_ampere_manual: bash /config/scripts/manual_mode_ampere_an_wb.sh "{{states('input_number.manual_mode_ampere')}}"
SCRIPT:
curl -X POST -H 'Content-Type: application/x-www-form-urlencoded' -H 'Accept: application/json' -d 'manualmodeamp='"$1" http://192.168.1.4/api/v1/chargecontrols/01/mode/manual/ampere
THAT WAS TOUGH