Low Vars:<br>

{if '{exp:low_variables:single var="test_var"}'}
    form: {test_var}: {exp:freeform_next:render form='{exp:low_variables:single var="test_var" parse="inward"}' parse='inward'}
{/if}

<br><br>

{exp:channel:entries limit="1"}
    Field:<br>
    {if freeform_chooser_test}
        form: {freeform_chooser_test}: {exp:freeform_next:render form="{freeform_chooser_test}"}
    {/if}

    <br><br>

    Grid:<br>
    {grid_test}
        {if grid_test:freeform_chooser_test}
            form: {grid_test:freeform_chooser_test}: {exp:freeform_next:render form="{grid_test:freeform_chooser_test}"}
        {/if}
    {/grid_test}

    <br><br>

    Fluid:<br>
    {test_fluid}
        {test_fluid:freeform_chooser_test}
            {if content}
                form: {content}: {exp:freeform_next:render form="{content}"}
            {/if}
        {/test_fluid:freeform_chooser_test}
    {/test_fluid}

    <br><br>

    Blocks:<br>
    {test_blocks}
        {test_block}
            {if test_chooser}
                form: {test_chooser}: {exp:freeform_next:render form="{test_chooser}"}
            {/if}
        {/test_block}
    {/test_blocks}
{/exp:channel:entries}