ChatMember.ReadWrite

const options = {
	authProvider,
};

const client = Client.init(options);

const conversationMember = {
    '@odata.type': '#microsoft.graph.aadUserConversationMember',
    '[email protected]': 'https://graph.microsoft.com/v1.0/users/8b081ef6-4792-4def-b2c9-c363a1bf41d5',
    visibleHistoryStartDateTime: '2019-04-18T23:51:43.255Z',
    roles: ['owner']
};

await client.api('/chats/19:[email protected]/members')
	.post(conversationMember);

Import-Module Microsoft.Graph.Teams

$params = @{
	"@odata.type" = "#microsoft.graph.aadUserConversationMember"
	"[email protected]" = "https://graph.microsoft.com/v1.0/users/8b081ef6-4792-4def-b2c9-c363a1bf41d5"
	visibleHistoryStartDateTime = [System.DateTime]::Parse("2019-04-18T23:51:43.255Z")
	roles = @(
	"owner"
)
}

New-MgChatMember -ChatId $chatId -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.models.aad_user_conversation_member import AadUserConversationMember
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = AadUserConversationMember(
	odata_type = "#microsoft.graph.aadUserConversationMember",
	visible_history_start_date_time = "2019-04-18T23:51:43.255Z",
	roles = [
		"owner",
	],
	additional_data = {
			"user@odata_bind" : "https://graph.microsoft.com/v1.0/users/8b081ef6-4792-4def-b2c9-c363a1bf41d5",
	}
)

result = await graph_client.chats.by_chat_id('chat-id').members.post(request_body)