How to Integrate Button component with Form component?

i try to add my custom button to the form, not to the header of form, but after some fields inside fieldset, i found some example here https://devdocs.magento.com/guides/v2.4/ui_comp_guide/components/ui-button.html like this

<form>
...
<fieldset>
    ...
    <button name="custom_button">
        <argument name="data" xsi:type="array">
            <item name="config" xsi:type="array">
                <item name="buttonClasses" xsi:type="string">custom-button-class</item>
                <item name="actions" xsi:type="array">
                    <item name="0" xsi:type="array">
                        <item name="targetName" xsi:type="string">TARGET_NAME</item>
                        <item name="actionName" xsi:type="string">ACTION_NAME</item>
                    </item>
                </item>
            </item>
        </argument>
        <settings>
            <displayAsLink>false</displayAsLink>
            <title translate="true">Custom Button</title>
        </settings>
    </button>
   </fieldset>
</form>

but in this code i cant chose my own controller actin, just chose between some of predefined. Actualy i need to add two buttons, which will send form data(sumbit form) to different actions. It must work like ‘save’ action, if i chose

<item name="actionName" xsi:type="string">save</item>

Anyone know, hot to do it? May be i can define my own action and set it here? Thak you a lot.