Soften the gelatin by sprinkling it over 1/2 cup cold water. Let stand 1 minute.
Using a medium pan over medium-high heat, bring to a boil remaining 1 1/2 cups water, sugar, and preserves. Add gelatin mixture, cocoa, chocolate chips, and chocolate. Bring to a boil; stir constantly for 2 minutes. Remove from heat.
Whisk until combined, about 3 minutes; strain through a fine sieve. Bring to room temperature before using.