Magento 2 how to get DataRange filter value?

I have added a DataRange filter like this on a listing ui component:

<column name="fecha_order" sortOrder="20">
            <settings>
                 <filter>dateRange</filter>
                <label translate="true">Fecha</label>
            </settings>
 </column>

Then I get the values here in a custom Data Provider

  public function addFilter(MagentoFrameworkApiFilter $filter)
    {
        $writer = new LaminasLogWriterStream(BP . '/var/log/filters.log');
        $logger = new LaminasLogLogger();
        $logger->addWriter($writer);

        $this->_session->start();
        $this->_session->setFrom($filter->getValue());
        $logger->info($filter->getValue());
        $logger->info($filter->getField());
    }

The only problem is that I’m getting both values like 1 single variable.
I get for example:
2021-09-01 05:00:00
2021-09-15 04:59:59

So the method is like executing 2 times.

But I need to get both in a single time because I’m storing it on a Session Variable.
I need to create a variable session From and a variable session To
How can I achieve that?
Thanks and greetings!