Most Indonesian brands with an international audience end up doing one of two things, and both are worse than they look. They run a second account that quietly dies after a month, or they stack both languages into one caption and end up with something twice as long that nobody finishes.
Decide which language leads
Not which is more important — which one the post is for. A recruitment post is for people here. A capability post aimed at regional clients is not. Once a post has a primary audience, the second language becomes a supporting line rather than a mirror, and it can be shorter.
Translate the point, not the sentence
Word-for-word translation is where bilingual captions get their stilted quality. The Indonesian version should sound like it was written in Indonesian by someone who meant it, which sometimes means a different joke, a different opening, or three sentences instead of five.
Let the image carry what it can
The most efficient bilingual post is one where the picture does the explaining and the caption only has to add tone. That is not a language trick, it is just better content — but it happens to solve the problem twice over.