Which kind of code to use

Hello,
I’m using this part of code inside a card:

custom_fields:
      battery: |
        [[[
         if (states["sensor.m2007j22g_battery_state"].state == "charging")
            return `<ha-icon
              icon="mdi:battery-charging"
              style="width: 20px; height: 20px;"></ha-icon
              <span>${states['sensor.m2007j22g_battery_level'].state}%</span>`
]]]
In the <span> tag, which is the command to use in order to choose the character dimension of battery level (XY%)?

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