Can you run GROQ inside a Document Preview?

preview: {
    select: {
      title: 'title',
      subtitle: 'type',
      type: 'type',
    },
    prepare({ title = 'Untitled', type, subtitle }) {
      const sub = // groq - does this doc reference the parent doc?;
      return {
        title,
        subtitle: sub,
        media: eosIcon,
      };
    },
  },

preview: {
    select: {
      title: 'title',
      subtitle: 'type',
      type: 'type',
      ref: 'relEos.0.relEos',
      id: '_id',
    },
    prepare({ title = 'Untitled', type, subtitle, ref, id }) {

      const references = ref ? ref : {};
      let bidirectional = false
      let refIds;
      if(!isEmpty(references)) {
        refIds = Object.entries(references).map(([key, value]) => value?._ref);
        bidirectional = refIds.includes(id);
      }

      return {
        title,
        subtitle: bidirectional ? `${subtitle.toUpperCase()} - Bidirectional` : subtitle.toUpperCase(),
      };
    },
  }