Cut a piece of kraft paper so that it fits into a loaf pan (the kraft paper will help give the strawberry yogurt chocolate bar its shape). Put a piece of parchment paper on top of the kraft paper.
Add the yogurt, lemon juice, vanilla extract, and sugar to a bowl and mix everything together.
Mix the unflavored gelatin powder with the appropriate amount of cold water according to the instructions on the package (do not add the boiling water called for as it will change the consistency). Stir the unflavored gelatin into the yogurt cream and refrigerate for 20 minutes.
Slice the strawberries into fourths and add to the yogurt cream. Gently fold in the whipped cream, pour the finished result into the loaf pan, smooth out the top, and refrigerate for 1 hour.
Add 3 oz of the milk chocolate and 3 oz of the semi-sweet chocolate to a bowl and let the chocolate melt over a hot water bath. Add some coconut oil to make the chocolate even smoother.
Evenly spread the melted chocolate over the hardened yogurt cream and refrigerate for another hour.
Melt the remaining chocolate over a hot water bath with some coconut oil. Meanwhile, flip the loaf pan over onto a cooling rack. Remove the kraft paper and parchment paper and use a cookie cutter or a spoon to create small grooves in the white mass. Pour the melted chocolate over the yogurt bar and refrigerate for 1 hour.