Possible to return BOTH structured (application/json) and unstructured (markdown) output?

Is it possible for Gemini request to return BOTH structured (application/json) and unstructured (markdown) output in a single API call? The use case:

(1) Structured output for backend business logic process and DB persistence.

(2) Unstructured (markdown) to show it on the UI, maybe for human-in-the-loop validation of the data returned by the model.

For example, I have the following string / object returned:
```
{"message":"{\n \"date_str\": \"28-07-2017\",\n \"vendor\": \"Walmart\",\n \"currency\": \"USD\",\n \"items\": [\n {\n \"name\": \"PET TOY\",\n \"amount\": 1.97\n },\n {\n \"name\": \"FLOPPY PUPPY\",\n \"amount\": 1.97\n },\n {\n \"name\": \"SSSUPREME S\",\n \"amount\": 4.97\n },\n {\n \"name\": \"2.5 SQUEAK\",\n \"amount\": 5.92\n },\n {\n \"name\": \"MUNCHY DMBEL\",\n \"amount\": 3.77\n },\n {\n \"name\": \"DOG TREAT\",\n \"amount\": 2.92\n },\n {\n \"name\": \"PED PCH 1\",\n \"amount\": 0.50\n },\n {\n \"name\": \"PED PCH 1\",\n \"amount\": 0.50\n },\n {\n \"name\": \"COUPON 23100\",\n \"amount\": 1.00\n },\n {\n \"name\": \"HNYMD SMORES\",\n \"amount\": 3.98\n },\n {\n \"name\": \"FRENCH DRSNG\",\n \"amount\": 1.98\n },\n {\n \"name\": \"3 ORANGES\",\n \"amount\": 5.47\n },\n {\n \"name\": \"BABY CARROTS\",\n \"amount\": 1.48\n },\n {\n \"name\": \"COLLARDS\",\n \"amount\": 1.24\n },\n {\n \"name\": \"CALZONE\",\n \"amount\": 2.50\n },\n {\n \"name\": \"MM RVW MNT\",\n \"amount\": 19.77\n },\n {\n \"name\": \"STKOBRLPLABL\",\n \"amount\": 1.97\n },\n {\n \"name\": \"STKOBRLPLABL\",\n \"amount\": 1.97\n },\n {\n \"name\": \"STKO SUNFLWR\",\n \"amount\": 0.97\n },\n {\n \"name\": \"STKO SUNFLWR\",\n \"amount\": 0.97\n },\n {\n \"name\": \"STKO SUNFLWR\",\n \"amount\": 0.97\n },\n {\n \"name\": \"STKO SUNFLWR\",\n \"amount\": 0.97\n },\n {\n \"name\": \"BLING BEADS\",\n \"amount\": 0.97\n },\n {\n \"name\": \"GREAT VALUE\",\n \"amount\": 9.97\n },\n {\n \"name\": \"LIPTON\",\n \"amount\": 4.48\n },\n {\n \"name\": \"DRY DOG\",\n \"amount\": 12.44\n }\n ],\n \"tax\": 4.59,\n \"total\": 98.21\n}"}
```
and I try to use `showdown` javascript library to convert it to markdown and `makeHtml` but to no avail. What I get on the UI is only an unformatted json string and it is difficult to verify if the model has missed anything or introduced any hallunication in it's reasoning.