I see there is an option to add new bees via datapacks, but I am not sure how to do that? Any chance we can get information on this process? Thanks!

The first thing to do is to create a directory called productivebees on the same level as recipes and tags. In that folder you will put the json files for your bees. The filename will be the name of the bee clay.json becomes Clay Bee and green_grass.json becomes Green Grass Bee. The internal name you will later use in recipes will be productivebees:clay and productivebees:green_grass. There are not many fields in the json yet, but you must include the primary (head) and secondary (abdomen) colors. You can use conditions just like in recipes.
See this example https://github.com/JDKDigital/productive-bees/blob/master/src/main/resources/data/productivebees/productivebees/ender_biotite.json
There are two other fields description which is the description shown in JEI and flowerTag which is the name of the block tag this bee will use as flowers. The tag name would be something like minecraft:flowers or forge:storage_blocks/lead. It defaults to minecraft:flowers if nothing is defined.

Next you can make breeding recipes or item conversion recipes, depending on how you want to obtain the bee. The location for the breeding recipe is recipes/bee_breeding and for conversion recipes/bee_conversion. An example of breeding https://github.com/JDKDigital/productive-bees/blob/master/src/main/resources/data/productivebees/recipes/bee_breeding/constantan_bee.json and conversion https://github.com/JDKDigital/productive-bees/blob/master/src/main/resources/data/productivebees/recipes/bee_conversion/manasteel_bee.json

You will then need to make a recipe for the bees production when inside a hive, the recipe is located in recipes/bee_produce. You will most likely just follow this format https://github.com/JDKDigital/productive-bees/blob/master/src/main/resources/data/productivebees/recipes/bee_produce/constantan_bee.json
The comb output has to be productivebees:configurable_honeycomb and the bee_type need to be the internal name of your bee.
item_output is the item produced if combs are disabled in the config.

Last you need a centrifuge recipe for your comb in recipes/centrifuge. For metals I usually make two recipes, one for the ingot and one for the dust (if any). The ingot recipe is disabled if a dust exist.
https://github.com/JDKDigital/productive-bees/blob/master/src/main/resources/data/productivebees/recipes/centrifuge/honeycomb_constantan.json
https://github.com/JDKDigital/productive-bees/blob/master/src/main/resources/data/productivebees/recipes/centrifuge/honeycomb_constantan_dust.json
The ingredient has to be productivebees:configurable_honeycomb and comb_type is the internal name of your bee.

Recipe for making comb blocks is done automatically.

Info added to repo readme.