Setting the charging threshold in the electric car

Configuration
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Sorry in advance, I’m still a beginner and am still having a bit of trouble with programming.
I have an electric car and I can control it via HA. ​​I would like to have a switch in a dashboard that limits the charging power to 80% or releases it to 100%. I can do this easily in Node-Red, but it’s a problem in HA. Can you help me?
Screenshot 2024-06-30 165928

![Screenshot 2024-06-30 170049|690x394](upload://jeAdtkFVvvRPhIpAHBCHiPqYdax.jpeg)
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