Add RxJava chaining request call

[anhanh11001]

Describe the feature you'd like
Add RxJava chaining request call

Would you like to work on the issue?
Yes

[issue-label-bot]

Issue-Label Bot is automatically applying the label feature to this issue, with a confidence of 0.98. Please mark this comment with 👍 or 👎 to give our bot feedback!

Links: app homepage, dashboard and code for this bot.