Overwrite the System node mass flow rate for baseboard

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I have referred one similar questions from this link: https://unmethours.com/question/22480...

I'm trying to control the supplied heating from the baseboard.

1. I tried to overwrite the baseboard water mass flow rate. However, it looks like the water mass flow rate is determined by the remaining heating load.
2. Is there any workarounds to control the supplied heating from baseboard?

Thank you!

_base_1_flow_act = api.exchange.get_actuator_handle(state, "System Node Setpoint", "Mass Flow Rate Setpoint", "THERMAL ZONE: 1 THERMAL ZONE BASEBOARD HW INLET")