Thanks for reaching out to us, the "Build the custom solution" preview feature is planned to release soon. But currently this feature is not available.
However, if you are only interested in filter out specific content, you can use the filter to change the level then decide what content you don't want to see in the result as below screenshot -
Also, you can leverage the blocklist to accomplish the filter if it's easy to build one, please have a try and let us know how it works.
Regards, Yutong
-Please kindly accept the answer if you feel helpful to support the community, thanks a lot.