There are services that can do that. https://www.pipes.digital/ https://www.pipes.digital/ is mine and filtering feeds is probably its main use case. There is a

There are services that can do that. https://www.pipes.digital/ https://www.pipes.digital/ is mine and filtering feeds is probably its main use case. There is also https://siftrss.com/ https://siftrss.com/ and I know that some RSS reader have similar functionality, like https://blog.feedly.com/leo-and-mute-filters/ https://blog.feedly.com/leo-and-mute-filters/.