Indonesians can obtain mortgages with salaries that are just a quarter of yours, making your salary quite good by Indonesian people standards. However, as a foreigner, there are restrictions on the properties you can buy, mainly regarding the minimum price. In Jakarta it is IDR 3b for an apartment in condominium and IDR 5b for a house on a plotted land. This is based on the Government Regulation GR 18/2021 and current Agrarian Ministry and National Land Agency Regulation No 1241/SK-HK.02/IX/2022
Due to these restrictions, it is highly unlikely that a bank will give you a mortgage, as you said you can not put a significant down payment due to lack of saving. Additionally, it is well known that foreign workers in Indonesia do not have permanent job contracts, which does not work in your favour when considering the duration of the mortgage. If you could get it it is highly likely you will pay a high premium price in term of interest rate to compensate this.
Another thing you need to consider before buying property in Indonesia is that, the laws and regulations can change quickly, easily and without much notice. When it comes to property ownership, foreigners have very limited rights. Currently, you can not have a freehold.
Nevertheless, if you want to try, you might have a better chance with a foreign bank especially the bank you have been banking at home, know your history that has a branch in Indonesia. If you decide to try please do share your experience so we could also learn.