one way I know is via RICH_TEXT asset created using groovy script with flag markDownText: true

Sample Groovy Code Snippet:

//--------STATIC PART------ 

def card = [:]; 

card['_id'] = "67777e6af9a34861c129c0f8"; 

card['assetStatus'] = 'APPROVED'; 

card['availableAfterTime'] = 1735883963371; 

card['visibleFromTime'] = 1735883963371; 

card['visibleTillTime'] = 2208988800000; 

card['expiryTime'] = 2208988800000; 

card['neverExpire'] = true; 

card['deletePostsOnExpiry'] = false; 

card['hasExtensionRequests'] = false; 

card['autoImported'] = false; 

card['locked'] = false; 

card['featured'] = false; 

card['publicAsset'] = false; 

card['restricted'] = false; 

card['createdByAd'] = false; 

card['hidden'] = false; 

card['contentEditingProhibitedInPublisher'] = false; 

card['channelTypes'] = []; 

card.channelTypes.add("SPRINKLR_LIVE_CHAT"); 

card['expiryModifiedTime'] = 1735884394357; 

// Approval block 

def approval = [:]; 

approval['approvalOption'] = 'NONE'; 

card['approval'] = approval; 

card['processInitiated'] = false; 

card['name'] = 'rich text'; 

card['assetType'] = 'TEMPLATE_ASSET'; 

card['assetSubType'] = ''; 

// Social Asset block 

def socialAsset = [:]; 

card['socialAsset'] = socialAsset; 

socialAsset['channelType'] = 'SPRINKLR_LIVE_CHAT'; 

socialAsset['templateType'] = 'RICH_TEXT'; 

socialAsset['omniChannelTemplate'] = true; 

socialAsset['_templateType'] = 'PRODUCT_BANNER'; 

socialAsset['_socialAssetType'] = 'TEMPLATE_ASSET'; 

// Content block 

def content = [:]; 

socialAsset['content'] = content; 

content['text'] = '**GREAT**';

content['disableManualResponse'] = true; 

content['samId'] = '67777e6af9a34861c129c0f8'; 

content['markdownText'] = true;

content['type'] = 'RICH_TEXT'; 

def otherConfigs = [:]; 

otherConfigs['__hiddenFields__'] = [:]; 

content['otherConfigs'] = otherConfigs; 

content['hideAttachment'] = false; 

content['voiceCommands'] = ''; 

content['_class'] = 'com.spr.sam.dataobject.templates.RichTextContent'; 

socialAsset['enabled'] = true; 

socialAsset['_class'] = 'com.spr.sam.dataobject.templates.TemplateAsset'; 

card['assetSource'] = 'SPRINKLR'; 

card['additionalDetails'] = [:]; 

card['isPrivate'] = false; 

card['deleted'] = false; 

card['permissionTypes'] = []; 

card['_class'] = 'com.spr.sam.dataobject.SocialMediaAsset'; 

JSON_UTILS.toJson(card);

return card;