You can use Biobizz RootJuice directly.
For the other Biobizz products, you can actually follow the feeding schedule.
http://www.biobizz.com/wp-content/uploads/2021/06/Nutrient-Schedule-EN_2021-Microbes.pdf
This refers to growing in Biobizz substrates, but it should also work for an outdoor grow.
If you've prepared your grow spot with enriched soil, you could refer to the recommendations for AllMix.
If you've planted your seeds directly in untreated soil that is lightly pre-fertilized,
then you should lean more towards the recommendations for LightMix.
In general, I would halve the values mentioned there at the beginning and see how it goes. And maybe gradually increase, depending on how the ladies like it.
Wishing you lots of success!