Alexa virtual devices with Matter-Hub add-on

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Hello everyone,
I use Home Assistant with the “Matter Hub” add-on to control various devices (heating, lights, etc.) or to check their status. In the bathroom, I have a motion sensor that turns off the light when no movement is detected after a certain period. After adjusting various parameters, this works very well.
BUT: When someone relaxes in the bathtub, the motion sensor doesn’t detect any movement, and the light turns off. To solve this problem, I can deactivate the timer by long-pressing the light switch. But you have to remember to do this BEFORE getting into the tub.
Of course, I can turn the light back on via Alexa (“Alexa, turn on the light”), but it then turns off again after the timeout without movement detection. That’s annoying.
I’m looking for a solution to deactivate the timer via Alexa, for example, by saying “Alexa, turn off the light timer.” I am currently trying to set a system variable with a virtual switch using Alexa, but I haven’t made progress yet.
I normally use the NodeRed add-on for automations but prefere configuration on most lowest level, eg. in order: HomeMatic (doe not direcly support Alexa → HomeAssistant → NodeRed-add-on.

Does anyone have an idea?

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Home Assistant’s Input Boolean Helper is one way to keep track of whether custom things are on or off. You can create a helper, let Alexa control it, and have your automation check the helper before turning the lights off. You can also automate turning the helper back on if it’s been off for more than, say, an hour.